Topic: four list of topics
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	Some strings of 4 digits		2020-06-26
		From Judy: I wrote previously and need more help. I need to generate a list of 4 digit. Numbers using 0-9 with no repetitions I know that there is a 6 followed by a 2. Order does matter Thank you in advance for your help. Answered by Penny Nom.
	Four digit combinations from 1-3-4-8-0		2020-03-26
		From nancy: Good evening. I'm in a quandry. Can you help? I would like to know what 4-digit combinations can be derived from 1-3-4-8-0 no repetitions Answered by Penny Nom.
	What is the smallest 4 digit number?		2020-01-10
		From Ullas: What is the smallest 4 digit number? Answered by Penny Nom.
	The fencing needed for a square pasture		2019-12-10
		From Penny: I'm trying to calculate how many feet of fence I will need to fence a 4 acre square pasture. Answered by Harley Weston.
	Four fours		2019-10-03
		From Irene: Using number 4, four times with any equation and the answer will be -2 and -5 Answered by Penny Nom.
	Four digit numbers from 0, 1, 2 and 3		2018-11-30
		From A parent: how many four digit numbers can be formed using nos.0,1,2,3 if repetition is allowed? Answered by Penny Nom.
	The area of a trapezoid		2018-09-24
		From An other: AB-272 feet: AC 690 feet; CD-330 Feet; DA-669Feet Calculate the area in feet and Acres. Answered by Penny Nom.
	Four odd factors		2018-07-04
		From Manchali: Find a number that has 4 factors and all of them are odd numbers. Answered by Penny Nom.
	What is small four-digit whole number?		2018-04-15
		From Rajesh: What is small four-digit whole number? Answered by Penny Nom.
	A four digit pass code		2018-02-26
		From Jessica: I was trying to fond out how many combinations could there be for a four digit pass code to a phone when no numbers are repeated? Answered by Penny Nom.
	The smallest and largest 4 digit integers		2017-06-13
		From Avneetpal: Difference of the smallest and biggest 4-digit number Answered by Penny Nom.
	4 digit codes with repeating digits		2017-06-01
		From Morgan: what are all possible 4 digit code repeating numbers? cuz i know that you have one website on it but, it doesn't repeat 2 numbers in a code. Answered by Harley.
	More on calculating the area (acreage) of a four-sided lot		2017-03-06
		From Kerri: Can you please show the formula used to calculate areas as provided on this page: Calculating the area (acreage) of a four-sided lot Answered by Penny Nom.
	Four digit numbers		2016-09-08
		From ning: 0000-9999 there is ten thousand 4-digit numbers. How to find the number of ways that 4 digit are the same? How to prove it by using formula? Answered by Penny Nom.
	The area of a 4-sided lot		2016-05-25
		From prasad: How to find area of a land whose sides are 41ft,33ft,32.3ft and 33.2 ft. Pl give me the formula and proof. Answered by Penny Nom.
	A six digit code		2016-05-06
		From Ralph: How many combinations are possible if a "safe" has four buttons and you can use a six digit code? (these are just single press buttons..)For example, this could be one possible combination: Button 4 Button 1 Button 1 Button 3 Button 2 Button 4. Thanks! Answered by Penny Nom.
	Subtraction in a base larger than ten		2016-01-31
		From Jenalee: Hello, So happy I found this site. I am having problems with bases. My question is 97B9 - 6A3A base 16 for both. Please help. Answered by Penny Nom.
	Four consecutive integers		2016-01-05
		From sherica: my teacher gave us an assignment and it says here that; THERE ARE FOUR CONSECUTIVE INTEGERS.IF THE SMALLEST ONE IS x ,FIND THE SUM OF THE FOUR INTEGERS. that is the question ...thanks hope that u can answer it Answered by Penny Nom.
	The perimeter of a 4 acre square		2015-12-16
		From samantha: What is the distance in miles or how many laps to make a mile, if one was walking around 4 acres of land which is like a square? Answered by Penny Nom.
	Four equations in 3 unknowns		2015-08-23
		From damien: solve: S x U - T = 44 T - U x S = 36 U + T - S = 7 U x U / S = 4 Answered by Penny Nom.
	20 golfers playing four rounds		2015-08-17
		From Paul: I have a party of 20 golfers playing four rounds in fourballs. I realise that everyone will have 7 players that they do not play with, however I want to ensure that no one plays with the same person twice and that the Captain plays with the 12 players of his choice. Answered by Victoria West.
	The game of 24		2015-01-21
		From aaron: 24 game whants me to use 11 14 5 and 9 to make 24 allowed (+ - dividing and multiplying) Answered by Penny Nom.
	4 rounds of golf as three foursomes		2014-08-18
		From Christopher: For our golf trip, we will be playing 4 rounds of golf as three foursomes. We would like to have each person play with everyone at least once. Is this possible? Answered by Victoria West.
	1÷[1-√2(order of surd is 4)]		2014-05-02
		From Anoushka: if t=1÷[1-√2(order of surd is 4)] , then t=? Answered by Penny Nom.
	Four digit phone numbers		2014-02-25
		From Tom: Hi, I'm an online math teacher, working on lessons for my students. This question is in their book and I can't do it...! Help! It has to do with phone numbers, and in this problem, we are only dealing with the last 4 digits of the number. It asks how many possible numbers we have if at least one digit repeats in the last 4 digits of the number. Answered by Penny Nom.
	Four tangent circles		2013-10-09
		From Nilesh: Four circular cardboard pieces, each of radius 7cm are placed in such a way that each piece touches two other pieces. How to find the area of the space enclosed by the four pieces? Please let me know. Answered by Robert Dawson.
	Four equations		2013-08-08
		From may: HI how to solve this 4 equations? A+C = 0 -4A+B-8C+D=1 3A+16C-8D=-29 -12A+3B+16D=5 Answered by Robert Dawson.
	Four circles		2013-05-29
		From varsha: four circular cardboard pieces each of radius 7cm are placed in such a way that each piece touches two other pieces. find the area enclosed by the four pieces. Answered by Penny Nom.
	Four digit combinations starting with 7 6		2013-05-15
		From Kaye: How do I find the rest of a four digit combination starting with 7 6? Answered by Penny Nom.
	A 4 digit code		2013-03-26
		From chris: I saw a previous question about a 4 digit code type thing and I was wondering if you could email me that same type of thing. I changed the pin number on my phone's lock screen and I tried hard to remember it, then I had to go help my mom with something and I automatically forgot it and there is no way for me to get back on my phone. I need all of the possible 4 digit number combinations without the numbers 0, 1, or 2. It cannot be repeating, ascending, or descending. I know you may not want to do all of them, but I really need it. Answered by Robert Dawson.
	f(x) + f ''''(x)=0		2013-03-05
		From Andreea: Hei. I don’t speak lot of english but here is my question,hope u understand: f(x) + f ````(x)=0. so, my question. what is f(x), where f ````(x) is f(x) derivative by four time ? i tried to find the answer and i knew f(x) is something like that f(x)=e^x*sinx but miss something. Answered by Brennan Yaremko.
	Four digit "combinations" using 0124		2013-02-27
		From Ayana: What are all the possible four digit combinations using 0124. Please list them for me. Thank you. Answered by Penny Nom.
	The zeros of a fourth degree polynomial		2013-01-23
		From Dakota: My problem has multiple steps and I have done everything but the last one. 8The original problem is f(x)=x^4-5x^3+7x^2+3x-10 and I have to find the zeros of the equation. I used synthetic substitution like my teacher taught us to get the equation of x^3-3x^2+x+5=0 but now I don't know how to get the zeros of that equation, or solve it. Answered by Penny Nom.
	A 4 digit phone lock using the digits 4, 2, 3 and 0		2012-12-24
		From Ragu: I would like to know formula for searching a combination of 4 digit. eg. I knew my Phone Lock combination is my car plate number 4230. But this time, i used another way around instead of 4230. But I am sure, there is only this 4 digits only. 4 & 2 & 3 & 0 Answered by Penny Nom.
	Some 4 digit numbers		2012-10-25
		From samira: How many 4-digit numbers are there in which the first and last digits are the same? Answered by Penny Nom.
	A four digit number		2012-10-09
		From cyndi: find this 4 digit number: the tens digit is 1/3 of the hundreds digit; the 2 digit number formed by the tens and ones digits i the largest prime number smaller than 40; the sum of all 4 digits is the same as the number of face on an icosahedron ? what is the number? Answered by Penny Nom.
	Four tangent circles		2012-10-04
		From renu: inside of a circle K of radius length measure R,three circular discs A,Band C each of radius r are placed so that each touches the other two and K . express R in terms of r. in the space between K, A and B , another circular disc D is placed which just touches K, A and B. if the radius is s, show that (6+root3)s=(2+root3)r Answered by Penny Nom.
	Four digit combinations from 1,2, ..., 9		2012-02-26
		From Errol: show me a list with all four digit combination numbers from 0 -9 Answered by Penny Nom.
	A four digit number		2011-09-16
		From gina: i am having a hard time figuring this out.. i believe the answer is 3105 but the 0 is throwing me off... i am a 4 digit number between 3100 and 3200, none of my digits are even, the sum of my digits is 9, the largest digit is in the ones place, what number am i ?? Answered by Penny Nom.
	Two line segments in the plane		2011-08-15
		From Tim: For this problem I actually have tried to visualise the image in my head many times. This question makes my head spin. Four points lie in a plane. They are partitioned into two pairs so that the sum of the lengths of the segments joining the points of each pair has the minimal possible value. Prove that these segments have no common points. Answered by Chris Fisher.
	The game of 24		2011-05-06
		From shaylin: how do you use 3,9,7,9 once in any operation equal to 24? Answered by Penny Nom.
	1 and four eights inches		2011-02-01
		From Miranda: WRITING TO EXPLAIN:If a line is measured as 1 and four eighth inches long,explain how you could simplify the measurement? Answered by Penny Nom.
	Golf pairings		2010-12-17
		From AL: I have a golf tourney where we have fourteen players and are playing five times/rounds of golf. I am trying to pair up two threesomes and two foursomes so we don't play with the same person twice or the least amount of times. Answered by Victoria West.
	What numbers can I be?		2010-11-13
		From john: my thousands digit is 2 times my ones digit.my hundreds digit is my ones digit plus 2. my tens digit is the difference between my thousands and hundreds digit what numbers can i be? Answered by Penny Nom.
	Four-digit numbers using 0,3,4,5,6,and 7		2010-11-12
		From Katy: Using only the digits 0,3,4,5,6,and 7, how many distinct four-digit numbers exist that are greater than 4002 and less than 6732? Answered by Stephen La Rocque.
	The area of a 4 sided region		2010-07-14
		From Cliff: If I wanted to know the square footage of an area that has four different sides and only had the length of one side and the angles at the ends of that length; could the other lengths be found if I wanted to have a total of 130,680 square feet? Answered by Robert Dawson and Tyler Wood.
	Four digit numbers		2010-05-22
		From tyeisha: Whats all the four digit numbers you can come up with using numbers 0-9 Answered by Tyler Wood.
	The game of 24		2010-02-20
		From haley: hello.... we have these very hard make 24 stumpers. i am stuck on one.... how can you make 24 using the numbers 7-7-13-18?? thanks! Answered by Claude Tardif.
	Expressing the natural numbers in terms of 4 fours.		2010-01-19
		From Steve: When I was studying mathematics, there were several of us that tried to express the natural numbers in terms of 4 fours. Allowing the use of any known math operation, for example n to the zeroth power is 1.Is there more info on this exercise. This was done mentally, nothing written down. Answered by Robert Dawson.
	Holiday for 7 golfers		2010-01-05
		From Andy: I am having difficulty scheduling pairings for a forthcoming Golf holiday. There are 7 players and we will be playing 7 rounds - each round will be a 3 ball and a 4 ball. I am trying to work out a schedule that means everyone plays with each other roughly the same number of times (with a minimum of, say, 3 times if possible). Also, we are looking to ensure everyone plays in roughly the same number of 3 and 4 balls. Any suggestions would be much appreciated (we leave in 10 days time). Thank you. Answered by Victoria West.
	Four digit numbers with no repeats		2010-01-02
		From Daniel: I want to know how many different numbers there would be between the numbers 0000-9999 that do not have any numbers that duplicate or repeat in the number? For example the first number would have to be 0123 and the last would be 9876 (I think) Thanks! Answered by Penny Nom.
	Four fours		2009-11-29
		From linda: Four Fours order of operations challenge i need problems using 4's only that have an answer of 13, 18, and 19 than you Answered by Penny Nom.
	Four consecutive odd integers		2009-10-24
		From Tonya: the sum of four consecutive odd intergers 2008 what are the intergers Answered by Penny Nom.
	Game of 24		2009-10-02
		From trami: game of 24 by using -4 -7 -7 1? Answered by Claude Tardif.
	Game of 24		2009-09-24
		From vanessa: Using the following numbers 13,6,6, and 12 to equal 24. Using 5th grade math Answered by Penny Nom and Claude Tardif.
	A four-digit positive integer		2009-09-04
		From TRACEY: I AM A FOUR-DIGIT POSITIVE INTEGER SUCH THAT THE SUM OF MY DIGITS IS 18 AND MY DIGITS REVERSED ARE EXACTLY FOUR TIMES GREATER THAN MYSELF. WHAT NUMBER AM I? Answered by Robert Dawson.
	The game of 24		2009-08-27
		From ANITA: Help I'm suppose to be a math expert, yet I can not yield 24 from the numbers 8,4,9,9, using each only once. HELP Answered by Penny Nom.
	The game of 24		2009-08-26
		From melvi: how can you get the numbner 24 but only useing the numbers 7,5,4,5 Answered by Penny Nom.
	Fourth and fifth degree polynomials		2009-08-20
		From Evin: hello.i am a student . ax^4+bx^3+cx^2+dx+e=0 x=? i want to learn the solution or formula of equations of the fourth and fifth degree...PLEASE Answered by Robert Dawson.
	Game of 24		2009-05-22
		From Sam: Using the numbers 7, 3, 2, and 2, how do you get the number 24? Answered by Claude Tardif and Harley Weston.
	Four-digit combinations		2009-04-18
		From Carri: How many 4-digit combinations can be made out of digits 1, 2, 3, 4, & 5 using each number once? What are the combinations? Answered by Penny Nom.
	A four-sided lot		2009-04-12
		From Robert: back of property is 137' across,with an angle of 122deg.on the left side and an angle of 140 deg. on the right side,the left side is 123' and the right side is 93' long,the left front is 130 deg. and the right front side is 150 deg. and the front of the property measures 78' Answered by Harley Weston.
	Four-digit numbers		2009-04-11
		From jp: How many four-digit numbers are there? Answered by Penny Nom.
	Game of 24		2009-04-05
		From Ramona: math 24 using 16, 9, 20, 7 Answered by Penny Nom.
	Four digit numbers		2009-03-10
		From Theresa: I need to know the number of 4 digit numbers that can be formed using 1-2-3-4 without repeating numbers Answered by Penny Nom.
	The game of 24		2009-03-01
		From Jeff: My son in the 5th grade was given a problem for extra credit and could use parents help. He was given the numbers 21, 13, 9, 6 and asked to use each number only once by +, -, /, x the numbers in any order to obtain an answer of 24. Answered by Harley Weston.
	A four digit number		2009-02-12
		From alex: the number of tens plus the number of hundreds equals the number of thousands. the number of ones is half the number of tens and one more than the number of hundreds the hundreds digit is 2. what is this four digit number Answered by Penny Nom.
	Four digit numbers using 1, 0, 2 and 8		2009-01-27
		From Mike: How many combinations of this four digit number 1028 can this produce only using those numbers. Example would be 0000, 0001,0002,0008,0010,0011,0012,0018,etc... Answered by Penny Nom.
	Three consecutive natural numbers		2009-01-26
		From abby: 1.what is the smallest four-digit number that is the sum of the three consecutive natural numbers? what are the three consecutive natural numbers that give this sum? 2.what is the largest three digit number whose square root is a prime? Answered by Penny Nom.
	A four digit passcode		2009-01-12
		From john: i have a machine at home that has a four digit passcode and the numbers range from 1 to 4 how can i get all the ways those numbers can be used Answered by Harley Weston.
	The game of 24		2008-11-24
		From Davey: this has us all stumped. 5 ,5 ,7 ,and9 = 24. Oh may you assist in ending our brain pain Answered by Penny Nom.
	Forming 10 from 4 fours		2008-11-06
		From Corderro: I need a answer for 10 using only the number 4 Answered by Penny Nom.
	The product of the digits of a four digit number		2008-07-26
		From Pete: I am a student preparing for a competition and this was one of the prep problems: The product of the digits of a four digit number is 6x5x4x3x2x1. how many such numbers are there with this property? Answered by Stephen La Rocque.
	Four fours		2008-06-25
		From jen: Use four 4's and some of the symbols: +,-,X, / and (), to give expressions for the whole numbers from 0 through9. Example : (4X4+4)/4=5 Answered by Janice Cotcher.
	The game of 24		2008-04-10
		From sherwin: ok is like this you must get 24 using 1,5,5,5 but you can only use +, - , / and * Answered by Claude Tardif.
	The game of 24		2008-04-01
		From Frank: Hi, my name is Frank. I have been really stumped on this 24-card. It has the 4 # of 21,3,5,10. If you have any suggestions, I would be grateful! Answered by Claude Tardif.
	I am a 4-digit number		2008-02-12
		From Nickie: I am a 4-digit number with no repeating digits. I am divisible by 5, my first two digits (left to right) make a number divisible by 3, and my first three digits make a number divisible by 4. Also, my digits have a sum of 19 and I have the digit 7 in the thousands place. Who am I? Answered by Penny Nom.
	Four digit numbers containing 85		2008-02-06
		From Vonda: How many four digit numbers contain the digit pattern 85 at least once and only once? Answered by Stephen La Rocque.
	The game of 24		2008-02-06
		From Jameeka: What is a solution for 10,11,9 and 2 (Using fractions) in the game 24 square. Answered by Penny Nom.
	The game of 24		2008-01-17
		From Raina: I have four numbers 3 3 9 5 that need to equal 24 using addition subtraction multipliction and division and I'm so stuck. Answered by Chris Langdon, Stephen La Rocque and Claude Tardif.
	The game of 24		2007-11-19
		From M: Please help...how would you compute 2,2, 6, and 9 to equal 24? Answered by Penny Nom.
	The game of 24		2007-11-17
		From Todd: Hello. My son is very good at the Math 24 game and when he is stumped, I am usually able to figure it out. However, we are both stumped with this one. The numbers are 6, 6, 9 and 5. You can use addition, subtraction, division and multiplication. Please help us equal 24 with those 4 numbers. Answered by Claude Tardif.
	Four digit odd numbers		2007-09-26
		From sonia: how many 4 digit odd numbers can be made using the digits 2, 5, 7, and 8 Answered by Penny Nom.
	Four digit combinations		2007-09-04
		From Natalie: Using The Numbers 7 4 5 How many different 4-digit combinations are possible, you can use any of the numbers twice. Answered by Penny Nom.
	The digital lock for a cell phone		2007-08-29
		From Hollie: i have a four digit lock code on my cell phone and cannot remember what it is. i know that it does not contain a 2 or a 4 and none of the numbers are repeated. the numbers range from 0 to nine and the only way to figure out what the code is, is to try randomly. I was wondering if you could give me a list of possible combinations using the information i gave you to make it easier to crack the code. Answered by Penny Nom.
	Four fours		2007-08-23
		From Belinda: My son came home with a math question that I can figure out. He needs to use only the number 4 and only four 4's, no less no more. The problems need the answers 11,13,14,and 18. He can use any mathematical sign except square root. He's been able to get all but these so far and I've worked them, but can't come up with the problems. Can anyone help? Answered by Stephen la Rocque.
	Four digit numbers		2007-07-30
		From Spence: My son has a problem that he has been unable to figure out. I was asked to try, but I am confused on how to get the last two parts. Any help would be great. Thanks Spence How many four-digit numbers can be formed under each condition? A) The leading digit cannot be zero: 9(10)(10)(10)=9000 B) The leading digit cannot be zero and no repetition of digits allowed: 9(9)(8)(7)=4536 C) The leading difit cannot be zero and the number must be less than 5000: ?? D) The leading digit cannot be zero and the number must be even: ?? Answered by Penny Nom.
	24 four-digit numbers		2007-04-21
		From Megon: Of the 24 four-digit numbers formed from the digits 1,2,3,&4 is there an easier way to find their sum other than writing them all out and totaling them by hand? Answered by Stephen La Rocque.
	A four digit number		2007-03-28
		From Paulo: Hi , if i have to discover a keypad number of four digit , Which the closest combination of getting right?? i have this tips ---> i know the second and thirth number is odd . dont have the number 7 in any digit , Doesnt begin with 8 or 4 ... and dont have the 2 as a last number . Thanks !! Answered by Stephen La Rocque.
	The game of 24		2007-03-09
		From colleen: We are playing the 24 math game where four numbers need to combine using any sign (+, - X, \) to equal 24. The four numbers are 22, 21, 6, 20. Answered by Penny Nom.
	Four digit numbers		2007-02-26
		From Anton: Hello! I would like to ask you how many combinations are possible using 4 digit number. # # # # (1...9).There is no zero,numbers don't repeat,second and forth are odd.Thanks Answered by Penny Nom.
	Four 9s		2006-12-15
		From A student: Can you make 67 with four 9's without using the ceilling method? Answered by Stephen La Rocque.
	Four digit combinations		2006-10-26
		From Sasha: CAN YOU LIST ALL OF THE POSSIBLE 4 DIGIT COMBINATION'S, THAT DO NOT START WITH 0? Answered by Stephen La Rocque.
	Four fours		2006-10-08
		From Prabh: Find out 10 BEDMAS problems using order of operation with only four 4's in the problem. The solution must be the digits 1-10. Example 44/44=1 Answered by Stephen La Rocque.
	Four 4's		2006-09-10
		From Ying: How can I use 4 four times, use any mathematical signs, such as +, -, times, division, ( ), !, square root to get answer 33, 41, or 45? Answered by Stephen La Rocque.
	Twenty golfers		2006-05-08
		From Mona: We have twenty golfers and four rounds of golf. We would like to figure out how to make foursomes so that each golfer plays with as many different golfers as possible. Answered by Penny Nom.
	9, 8, 7 and 2 in the game of 24		2006-03-17
		From Alana: I just began student teaching in a 5th grade math class and found that the students play 24 in class, a game that I used to play in elementary school. The students choose a card which shows 4 numbers and then have to use any combination of addition, subtraction, multiplication, and division to reach 24. There was one card that we found that seems to have all of us stumped. The four numbers are 9, 8, 7 and 2. Can you figure out how to make 24 with those? Thanks so much for your help! Answered by Claude Tardif.
	The game of 24 with 7, 5, 5 and 4		2005-12-18
		From Nicole: i was playing the 24 game the other day. you get 4 digits and you have to turn them into 24. You can use addition, subtraction, division, and multiplication. You have to use all the numbers but you can only use each number once. an example is 2 4 4 1 the answer is (2x4)(4-1)=24. I got stuck on one. The numbers were 7 5 5 4 . Answered by Penny Nom.
	The game of 24		2005-10-10
		From Kim and Chris: My 4th grade son came home with a math game called 24 game. In it each card has 4 numbers on it. Each number can only be used once, in any order, using multiplication, subtraction, division, or addition. We are stuck on one and wondered if you could help. The four numbers are: 9, 9, 9, 9. And they must equal 24. Any clues? Answered by Claude Tardif.
	The game of 24		2005-01-10
		From Manny: HI - my daughter and I are being driven crazy by the following "24" question 7,7,3,3. She's good at the game (well, better than I am) and her teacher gave her this one. Any insight would be appreciated! Answered by Claude Tardif.
	The game of 24		2004-09-16
		From Angelica: how can you make 24 out of 7,7,6,5? Answered by Claude Tardif.
	The game of 24		2004-09-14
		From Alan: I was playing that math 24 game and i cant get 21,14,2,2 to equal 24 Answered by Claude Tardif.
	The 24 game		2004-09-09
		From Erik: Ive spent around 40 hours on this one problem. I need help. 3,3,7,7 Answered by Claide Tardif.
	The game of 24		2004-06-04
		From Samantha: i have the game 24 (the one where you have to use multiplication, division, addition, and subtraction to get to the answer 24) I was playing when i came across the 4 numbers 20, 17, 7, 11 and i cant seem to get 24. Answered by Claude Tardif.
	37 with four 4'2		2004-01-03
		From Myra: Using four fours and only four fours to get an answer of 37. Answered by Claude Tardif.
	Four digit combinations		2003-12-31
		From A student: i need all 4 digit combinations using 0-9 please Answered by Penny Nom.
	Four digit numbers		2003-11-20
		From Rob: Hello, I sure hope you can answer this question. I got into a discussion at work about how many possible combinations there are for a four digit number using the numbers 0 through 9. This was in reference to a discussion about the lottery. I said there was only 10,000 possible combinations. My friend said that there was many times more, but he could not remember how to figure it out. The answer and the formula would be greatly appreciated. Answered by Penny Nom.
	The 4th difference		2003-11-17
		From Jack: If i had a sequence which was the same at the 4th difference, aka difference to the 4th, like: 1 5 14 30 56 96 (sequence) 4 9 16 26 40 5 7 10 14 2 3 4 1 1 then what would be the set formulars to find out a, b, c, d, and e as i know the equation has to be an4+bn3+cn2+dn+e Answered by Penny Nom.
	The game of 24		2003-09-03
		From A student: We have a game where four numbers must equal 24 using addition, subtraction, multiplication and/or division.Ý I am stuck on the following four numbers - 12, 24, 9 and 17. Answered by Penny Nom.
	Two sequences that agree in the first 4 terms		2003-05-26
		From A student: Is it possible to have two formulas that define sequences that agree on the first four terms but not the rest? Answered by Penny Nom.
	Four digit palindromes		2003-05-05
		From Heather: How many palindromes were in between the numbers 1000 and 9999? Answered by Penny Nom.
	4 x abcd = dcba		2002-11-20
		From A student: Say you have a four digit number (e.g. abcd) and you multiply the number by 4. The answer you get will be the reverse order of the number you started with (dcba). What is the number? The four digits (a,b,c,d) cannot be the same number or cannot be repeated. Answered by Penny Nom and Claude Tardif.
	The 24 game		2002-11-16
		From Michael: Hello, my name is Michael and I am in elementary school .. We have a game we play in math class called 24 game. In it each card has 4 numbers on it. Each number can only be used once, in any order, using multiplication, subtraction, division, or addition. We are stuck on one and wondered if you could help. The four numbers are 10-9-16-4. And they must equal 24. Any clues? Answered by Penny Nom.
	The four colour theorem		2002-10-27
		From Rhonda: is there an actual equation for the four colour map theorem??? i cannot find it anywhere!! if so can you give a breif description on how it works!! Answered by Penny Nom.
	Use a 4 four times		2002-09-12
		From Amanda: The question is what is if you can only use a 4 four times and get the answer 12, 10, and 6 Answered by Claude tardif.
	Sequences that agree on their first four terms		2002-05-16
		From Mike: Are there two formulas that define sequences that agree on their first four terms, but differ on the fifth term and all succeeding terms? Answered by Chris Fisher.
	The square root of four		2002-04-13
		From Frank: In a recent quiz we where asked the square root of four. The quizmaster gave the answer as not only 2 but also -2. Being pedantic I queried this. Although -2 squared is 4, does it follow that the root of 4 is -2 Can you enlighten us? Answered by Claude Tardif and Penny Nom.
	All four eights in three consecutive hands		2002-04-01
		From Blair: What are the odds against the same person holding all four eights in three consecutive hands. Answered by Brian Alspach.
	Some 5 card hands		2002-03-28
		From A student: From a standard deck of cards how many 5 card hands are possible consisting of a. exactly 4 hearts b. two cards of one kind and three of another(like a full house). Answered by Penny Nom.
	100 from four 9's		2002-03-27
		From A student: My teacher gave us a math problem to try and figure out and I am stumped. The problem was this.... by only using four nines, how can you get an answer of 100? You can add, subtract, multiply or divide...anything you need to do ,but you can only use four nines. Answered by Leeanne Boehm.
	Double square roots		2002-02-17
		From Ali: i have a question about how to do double square roots with variables and powers. example : v/"" v/"" 81y8 Answered by Harley Weston.
	Making 24		2002-01-17
		From Renee: My 4th grade daughter and I need to find a simple math sentence using 5, 5, 3, & 7 to equal 24. You can add, subtract, divide or multiple. Answered by Penny Nom.
	4 digit combinations		2001-09-22
		From Laura: I need all of the 4 digit combinations using the numbers 0-9. Answered by Harley Weston.
	Fourier transform		2001-08-07
		From Adbul: Sir, we have the Dirichlet's condition for the Fourier transform : " The function should be integral over the real line " But why we are we neglecting this for example when we take the Fourier transform of an impulse train? Suppose we want to travel from one corner of a square of side 'a' to the diagonally opposite corner. We can travel along the sides which gives a pah length of '2a'. We can also do it in steps as shown below: _ | |_PATH | |_ |_____| Suppose The step size =DELTA x Then the path length will be again '2a'. Now in the limit DELTA x -->0 again we get '2a' But when we take the limit we get the straight line diagonal whose length is 'SQRT(2)X a' Where did I go wrong? Answered by Chris Fisher.
	Securing a plank in four dimensions		2001-06-06
		From Becca: If it takes two nails to secure a plank from rotating on a wall in the third spatial dimension, how many nails would it take if you were attempting to secure the board from rotating in the fourth spatial dimension? Answered by Walter Whiteley.
	Four digit numbers from 1,2,3,4,5,6,7,8		2001-05-31
		From Katie: Okay.......here's my question...how many different ways can you form a four digit number out of these digits..1,2,3,4,5,6,7,8? This is how my teacher said to do this.... 8*8, 7*7,6*6,5*5,4*4,3*3,2*2,1*1. then she said to add up the products and to multiply by 7. is this correct, and if not how can you figure this out. Answered by Penny Nom and Claude Tardif.
	Five fourths		2001-04-08
		From Linda: Can you have 5/4 of something? Answered by Penny Nom.
	A four dimensional object		2001-02-14
		From A student: Can you give me some examples of a four dimensional object you can find around your house? Answered by Harley Weston.
	Four crayons		2001-01-10
		From Neyra Espinoza: You have four crayons (red, blue, yellow, green). If you line them up, how many different combinations can you get? Answered by Patrick Maidorn.
	4-digit numbers using 7, 8, 9 and 0		2000-09-13
		From Ryan: Could you please help me with the following problem, How many different 4-digit numbers are there that use each of the digits 7,8,9,and 0? Please list them. Answered by Penny Nom.
	4 Color map Theorem		2000-06-02
		From Rick Slen: I am challenging my students to find a map that can not be coloured using only 4 colours. I know that it is not possible, but one boy drew a map with a "country" totally surrounding all the others so of course it touched all other colours. How do I explain that this type of map is not permissable? Answered by Denis Hanson.
	Is a sheet of paper 2-dimensional?		2000-03-06
		From Jaclyn Evans: One day, we were discussing 3-dimensional items. Is a sheet of paper considered a 3-dimensional shape? Or is it 2-dimensional as described by 8.5 by 11 size? Also, could you give me an example of a 4-dimensional item or scenario? Answered by Harley Weston.
	Four fours		1999-09-09
		From Roger: I need help with a math problem my child asked me about I guess in her 7th grade math class they were told to come up with a answer from 1-10 only using four 4's and she got stuck on the problem that needs to be equal to ten, she asked me and I couldn't help her it's sad so if you could give me the problem and and answer so i could explain it to her I would really appreciate it. Answered by Penny Nom.
	Measuring the fourth dimension		1999-06-07
		From Suzanne Hall: Hi! The other day, two of my students asked a very interesting question: Is the fourth dimension measured with hypercubes? Their reasoning went like this: Lines are 1D and are measured with line segments, which are part of a line. Planes are 2D and are measured with squares, which are part of a plane. Space is 3D and is measured with cubes, which are part of space. So, logically, hypercubes would be used to measure the fourth dimension. Answered by Chris Fisher.
	Four Corners Maths Problem		1999-02-16
		From Helen Williams: I am currently a student teacher in the UK and I have to write a 1000 word report on the following maths problem which I am completely stuck on! PLease HELP!! Choose and 3 by 3 section of the hundred square. Add the total of the four corners. How many different groups of four numbers can you find that add up to that number? eg, 1 2 3 11 12 13 21 22 23 Total of 4 corners add up to 48. Adding 2, 13, 22, 11 also make 48 etc.. How many different groups of 4 numbers would add up to 48? How would these results compare with thoses obtained from a 3 by 3 square in which the numbers are consective? eg, 1 2 3 4 5 6 7 8 9 PLEASE HELP AS I AM COMPLETELY STUCK? WHY DO ALL THESE DIFFERENT WAYS ADD UP TO THE SAME NUMBER?? Answered by Harley Weston.
	Grade 4 curriculum		1999-02-09
		From John: My daughter is in grade 4 and her math teacher has asked her to write out the number 1 to 10,000. She is currently at 4567 and is sick of it. When I complained that this was not a usefull exercise she said that the Ministry of Education curriculum requires this and gave a photocopy of the page. It states: "read and write whole number to 10,000 in standard, expanded, and written forms (eg., 9367=9000+300+60+7 = nine thousand three hundred sixty-seven). Has the teacher interpreted this the wrong way? Thanks John PS. Do you have a web address for Ontario Math and Science Teachers organization? Answered by Jack LeSage.
	The Fourth Dimension		1998-05-24
		From Whitney Page: Okay, here goes all my effort to try to explain shat I'm trying to ask of you. It's about something I read in a book called A WRINKLE IN TIME, by Madeline L'Engle. It's called tesser, or tesseract. It talks about first diminsion, a straight line, second diminsion, a flat square, and third diminsion, a square with sides, front and back, top and bottom. I can picture all of that. Then it says that fourth diminsion is when you square the three diminsional square. It also described the fourth diminsion as time. I can't figure out how that can be. Then it says... Answered by Chris Fisher.

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