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2.5 acres |
2009-06-16 |
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From Debbie:
I just purchased 2.5 acres but must sever it myself. She sold me 2.5 acres, equal on all sides. How many feet on each side?
Answered by Penny Nom. |
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You have the numbers 1 through 8, ... |
2009-06-15 |
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From Maryland:
You have the numbers 1 through 8, you can only use each number one time. Two of the numbers are multiplied together, two are subtracted, two more are subtracted and the last two are subtracted. All the answers are the same.
Can't get it, I have racked my brain trying to help.
Answered by Claude Tardif. |
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nC0 + nC1 + nC2 + ... + nCn = 2^n |
2009-06-15 |
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From Chinonyerem:
For n >= 1, derive the identity
nC0 + nC1 + nC2 + ... + nCn = 2^n
[Hint: Let a = b = 1 in the binomial theorem]
Answered by Penny Nom. |
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11 golfers playing 4 rounds |
2009-06-14 |
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From Brian:
I have 11 golfers playing 4 rounds of golf. It would be great if we could play at least once with everybody. I realize we will have 2 foursomes and 1 threesome each round...can you help?
Answered by Victoria West. |
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Averaging percentages |
2009-06-14 |
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From Alan:
Can you add percentages and then divide them by the number of percentages to get the average percentage.
I.E day 1 100% day 2 100% day 3 95% average= 98.3%
is the above possible or is it not done, I have a dispute with a work colleague over this.
many thanks
Answered by Harley Weston. |
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Number & Operation Puzzle |
2009-06-12 |
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From Francine:
How can I get the number 26 using 1,2,3,4,&5 and using addition, subtraction, multiplication and division. Each operator and digit must be used exactly once. My son presented me this question and I can't determine if it's even possible.
Answered by Janice Cotcher. |
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Volume of a Can |
2009-06-12 |
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From Zach:
A can of soda has a volume of 355 mL. The area of a circle is given as A=pieR2, where r= radius of the circle. So, the volume of the can is given by V=(pier2)h, where h is the height of the can. If a particular can has a height of 12.2 cm what is the radius of the can?
I know the answer is 3.04 cm. I need help figuring out how to arrive at this answer- what were the mathmatical steps?
Thanks,
Zach
Answered by Stephen La Rocque. |
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The radius of an arc |
2009-06-12 |
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From Billy:
I have tried using the formula 4h2(squared)plus L2(squared)divided by 8h
to find the radius of an arc, but I must be doing something wrong since I keep
getting the wrong answer. Can you tell me what I am doing wrong. The height
is 37.75 in. and the length is 18.875 in. Thank you for any help you can
give me.
Answered by Stephen La Rocque. |
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The last non cero digit of a factorial |
2009-06-12 |
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From Wilson:
How can I find the last non cero digit from a factorial calculation of a big number.
For example 10! = 3628800, the last non cero digit is 8.
What is the last non cero digit of 10! ??
Answered by Robert Dawson. |
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The product of gradients between 2 perpendiculars lines |
2009-06-11 |
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From Alister:
how do i prove that the product of gradients between 2 perpendiculars lines equal to -1....
Answered by Penny Nom. |
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A rotating schedule |
2009-06-10 |
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From Doreen:
We have seven people - we want to create a rotating schedule for two people at a time to attend one day a week with each person working the same amount of days in the year.
Answered by Victoria West. |
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A number puzzle |
2009-06-10 |
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From Ann:
Hey,
I have a math problem that I can't solve which just happens to be a "must-answer". The answer to the first problem is 25,452 and the second is 21,232. I know how to add but my teacher said that there is a pattern wherein you just have to look at the set of numbers and you already know the answer without really adding it first. Here are the condition of the problem:
1) the first, second and fourth numbers were provided by me. ( I have no idea how this works)
2) the third and the fifth numbers were given by the teacher. ( She's the one who knows the technique)
# She says that there is a "pattern."
Help me please as soon as you can. Thanks!!! Here it is:
5454 1234
+ 3636 5678 6363
4321
2323
8765
7676 1234
_______ _________
Please answer ASAP. Thank you!!!
Answered by Penny Nom. |
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Unit Price |
2009-06-08 |
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From MATTHEW:
Question from Matt:
I quoted my customer $112.50 per 1,000 sheets per linear yards. My client said I was to high. I need to be at 18 cents per square inch. If I matched his 18 cents per square ines what would my linear yards per 1,000 sheets price be? It comes on a 12.5 inch roll.
Answered by Janice Cotcher. |
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Real World Applications of Mathematical Skills |
2009-06-08 |
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From Kathy:
I am teaching a student who is on the life skills program and is at the stage 2 level for maths but is in year 9 (stage 3). I am looking for maths lessons that will help her in life. Like maths in shopping, maths in fashion, maths in the home etc. Your help in finding lesson plans is urgently needed.
Answered by Janice Cotcher. |
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Vectors and the Law of Cosine |
2009-06-08 |
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From lauren:
once force of 20 pounds and one force of 15 pounds act on a body at the same point so that the resultant force is 19 pounds. Find, to the nearest degree, the angle between the two original forces
Answered by Janice Cotcher. |
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