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The area of a parallelogram |
2003-04-06 |
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From A student:
Find the area of the parallelogram with vertices (0,0),(7,2),(10,7),(3,5)
Answered by Penny Nom. |
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The height of an equilateral triangle |
2003-04-06 |
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From Rosa:
If Each side of an equilateral triangle is 10 m. What is the height?
Answered by Penny Nom. |
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How many hits? |
2003-04-06 |
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From Jack:
My name is Jack. I'm a uncle. Student is in the 5th grade email is above. If a baseball player at sping training had a good season with the following: one seventh of his hits were doubles.
12.5% of his hits were home runs.
But didn't have any triples.
How many hits did he have? Can you give me an explanation of you solved the problem.
Answered by Penny Nom. |
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Divide a circle in 8 equal pieces |
2003-04-04 |
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From Naomi:
I have to divide a circle in 8 equal pieces but can only cut 3 times
can you please help me
Answered by Penny Nom. |
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La somme de 51 nombres entiers consécutifs est 1785 |
2003-04-01 |
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From Katrine et Armand:
La somme de 51 nombres entiers consécutifs est 1785, quels sont ces nombres? (indication : on rappelle que pour tout entier P, on a 1 + 2 + ....+ P = P (P + 1) / 2).
Answered by Claude Tardif et Penny Nom. |
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Uses of conic sections |
2003-04-01 |
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From William:
My name is William and I am doing a research paper on conic sections for my 12th grade math class. Part of the project is to find two conic sections in our world today and explain what there purpose is. I really need help in this area because I've been searching the internet for where conic sections are used in our world today and I really can't find anything. If you can tell me specific building or a pyramid that contains conic sections that would be great. Or even something in the universe would be helpful.
Answered by Leeanne Boehm. |
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Doubling the size of an object |
2003-04-01 |
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From Dave:
If I have a known surface area and volume of an unknown object and I want to double the size of the object, how do I find the new area and volume?
Answered by Walter Whiteley. |
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Le terme |
2003-04-01 |
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From Francine:
Je suis une enseignante de 5e/6e et j'aimerais savoir comment on traduit le terme "array" en français.
Answered by Claude Tardif. |
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A handshake problem |
2003-03-31 |
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From Jaylan:
Suppose you and your partner attend a party with n other couples. Several handshakes took place. No one shook hands with himself (or herself) or with their partner, and no one shook hands with the same person more than once. After all the handshaking was completed, suppose you asked each person, including your partner, how many hands they had shaken. Each person gave a different answer.
Determine how many hands did you shake and how many hands did your partner shake when n=5
Answered by Penny Nom. |
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Quadratic word problems |
2003-03-30 |
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From A student:
Question:
i think i know the basics of how to solve direct quadratic equations,but how do i go about solving those word problems? i have tried them times and again, but nothing seems to work at all!they are driving me crazy! pls help!:):):):):) - bob & nick earned $1260 each. bob's hourly wage is $3 more than nick's hourly wage. he worked 2h less compared to nick. find the number of hours nick worked.
- there are 2 tanks in henry's house. in tank A, the fish are all goldfish. they are bought at a total cost of $259. in tank B, there are only guppies. the guppies were bought at a cost of $1.20 each. a day later,henry bought 3 more goldfish and put them into tank A. the number of guppies in tank B is now twice the number of goldfish in tank A.the total cost of all the fish that henry has presently,i.e. goldfish & guppies, is $355.30. given that the cost of each goldfish is the same,
a)find the initial number of goldfish in tank A
b)find the total cost of all the guppies. - a particular disc can be made to rotate at 2 different speeds. if it is made to rotate slower by 135 revolutions per hour, it wld require an additional 2.7 hour to make 315 revolutions. find the higher speed at which it can operate.
Answered by Penny Nom. |
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12*nC2 = n! |
2003-03-30 |
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From A tutor:
Solve for "N"
12*nC2=N!
Answered by Walter Whiteley. |
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The vertex of a cone |
2003-03-27 |
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From Holly:
I read your response to Callie about whether a cone has a vertex or not. Is it ONLY a vertex if both halves of the cone are together or can one half of the illustration have a vertex?
Answered by Walter Whiteley. |
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Can twice a square be a square? |
2003-03-25 |
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From Mike:
The other day it occurred to some students that they could think of no square number which is an integer, which can be divided into two equal square numbers which are intergers, Or put another way, no squared integer when doubled can equal another square integer. For example 5 squared plus 5 squared is 50, but 50 is not a square number.
Answered by Walter Whiteley and Claude Tardif. |
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A royal flush |
2003-03-24 |
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From Vikki:
A poker hand consists of 5 cards selected randomly from an ordinary deck of cards: find the probability of a ROYAL FLUSH : the 10 , jack, queen,king and ace of the same suit. I was thinking somewhere along the lines of: *the number of ways to get the suit is 4C1
*the number of ways to get a 10 out of the 13 cards etc.... ...but Im not sure I am going about this the right way, could you help?
Answered by Andrei Volodin. |
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Friends and enemies |
2003-03-24 |
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From Becky:
Consider a room that contains six people. Any two people are either friends of each other, or they are enemies. A. Argue why there are three people, all who are friends, or there are at least three people, all who are enemies
B. Rephrase the situation using graph terminology, using all of these terms correctly: vertex, edge, graph, complement, clique, independent set, and bipartite.
Answered by Penny Nom. |
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