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Percentages |
1998-07-10 |
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From Adam:
Hi,
I would like to know the basics of percentages. It is all rather confusing to me.I have excelled in math but want to be ready next year for more advanced math. What is Percentages?
Answered by Penny Nom. |
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Social Security Numbers |
1998-07-07 |
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From Valerie Lucas:
How many social security numbers are possible? the answer is 10^9 why isn't the answer 9^9?
Answered by Harley Weston. |
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A Calculus Problem |
1998-06-28 |
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From Lorraine:
I'm a post-secondary student taking calculus by correspondence. I'm stuck on the following question (and similar ones) Can you help? Evaluate the following indefinite integral: d(theta)
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1 + sin (theta) (It says to multiply both numerator and denominator by: 1 - sin(theta) Thanks
Lorraine
Answered by Harley Weston. |
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15 to the zero |
1998-06-24 |
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From Mike Husken:
My daughter has the problem: 15 with an exponent of zero=1. Could you help explain why? I would appreciate an answer soon as she has class tomorrow.
thanks,
Answered by Penny Nom and Patrick Maidorn. |
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Difference of squares |
1998-06-23 |
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From Kristen Smelsky:
Solve the following using a difference of squares: 4x(squared) minus 4xy plus y(squared) minus m(squared) plus 2m minus 1
Answered by Penny Nom. |
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The Birthday Problem |
1998-06-12 |
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From Josh Skolnick:
if you are at a party what is the least amount of people that have to be there to have at least a 50% chance of having 2 people with the same birthday? and how do you get the answer thank you in advance josh
Answered by Harley Weston. |
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Rolling a seven |
1998-06-11 |
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From Bruce Thompson:
What is the probablity of rolling two dice and it coming out as seven? a) 1/6
b) 1/36 please give me the correct awnser and explain please.
Answered by Harley Weston. |
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Grade 9 Algebra |
1998-06-07 |
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From Tarah Kostenko:
I am a grade 9 student and I cannot figure out how to solve these two similar problems. can you please help?
-3(y-1/2)=1/2 also -2/3(x + 1)=6
I don't come up with the same answers as the book and I can't figure out what I'm doing wrong. Thank you,
Answered by Harley Weston. |
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A Logic Problem |
1998-06-07 |
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From Anthony Bacigalupo:
My name is Anthony Bacigalupo and I take Sequential ][ Math and am taking a practice regents. When doing a logic problem, I encountered the following statements, where I am trying to prove P ( I left out steps unrelated to the question)....
Answered by Chris Fisher. |
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A trig limit |
1998-05-28 |
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From Ann:
This problem is a calculus 1 limit problem-high school level. I'm teaching myself calc over the summer and I'm already stumped. find the limit lim sec^(2)[(sqrt2)(p)]-1 p-->0 --------------------- 1-sec^(2)[(sqrt3)(p)] I'm Ann.
Answered by Harley Weston. |
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Sequences and series |
1998-05-27 |
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From Michael Le Francois:
The sum of the first ten terms of an arithmetic series is 100 and the first term is 1. Find the 10th term. The common ratio in a certain geometric sequence is r=0.2 and the sum of the first four terms is 1248 find the first term.
Answered by Penny Nom. |
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Trigonometry history |
1998-05-26 |
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From Joeseph Huckler:
Can you please tell me some history of the trigonometric ratio Tangent? who discovered it? when was it discovered and some other useful info...
Answered by Penny Nom. |
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A Place Value Curiosity |
1998-05-25 |
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From Ed:
I was visiting with an elderly gentleman this afternoon. He showed me this curiosity and then asked if I could explain it to him. Can you provide an explanation of why the 9 or multiple of 9 keeps occurring in this procedure? Choose any number, say 125 and add the digits to get 8. subtract the 8 from the 125 and the result is 117. Add the digits in 117 to get 9. Subtract the 9 from the 117 to get 108. Add the digits in 108 to get 9. If this procedure continues a 9 or a multiple of 9 reoccurs. What is the mathematical explanation behind this happening?
Answered by Denis Hanson. |
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The Fourth Dimension |
1998-05-24 |
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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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Percentage Question |
1998-05-18 |
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From Eddie Knox:
Example: If I have a recipe calling for 16 ounces of 4% vinegar (vinegar which has been diluted with water to a strength of 4%), and all I have on hand is 16 ounces of 5% vinegar, how much water should I add to decrease the strength to 4%, before measuring the 16 ounces to be used. I'll appreciate any insight and help. Thank you so much!
Answered by Harley Weston. |
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