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Order of operations |
2003-02-16 |
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From A student: How is the order of operation used in everyday life other than in a math class or at school? Also .... Can you give me a list of all the mathematician that are still living that uses the order of operation? Answered by Claude Tardif. |
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Numbers in base 5 |
2003-02-16 |
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From Lori: I'm trying to help my 6th grader with converting numbers like 82 to base 5 and 182 to base 12. We saw your examples on 613, but still are confused. Answered by Penny Nom. |
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Order of operations |
2003-02-15 |
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From Debbie: Question: 20-(9+4)x7=? Possible answer -71 or 49? Answered by Penny Nom. |
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A determinant |
2003-02-13 |
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From A student:
I have to find the determinant of the following matrix -2 | 3 | 1 | 2 | 4 | -3 | 0 | -2 | 5 | 1 | 4 | 2 | 1 | -3 | 5 | 2 | 3 | 4 | -1 | 2 | 6 | 0 | 3 | 2 | -4 | Answered by Penny Nom. |
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Wrap a rope around the equator |
2003-02-12 |
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From Ali: If you take a rope and wrap it around the equator and then overlap it 6ft. and cut off the extra then you loosen it up so the ends meet how far would it stand off the ground? Answered by Penny Nom. |
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Multiples of all four of the numbers 2, 3, 4, and 5 |
2003-02-11 |
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From Stephanie: How many of the first 1000 positive integers are multiples of all four of the numbers 2, 3, 4, and 5? Answered by Penny Nom. |
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Storyteller figurines |
2003-02-10 |
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From A student: It takes 3/4 of an hour to bake a storyteller figurine. If only one figurine can be baked at a time, how many can be baked in 6 hours? Answered by Penny Nom. |
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Splitting weight |
2003-02-10 |
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From Jin Ho: A balance scale has only two weights, 1 ounce and 4 ounces. In only three weighings split 180 ounces of seed in two bags of 40 and 140 ounces. Answered by Penny Nom. |
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Finite differences |
2003-02-10 |
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From Jenny:
I need to find a formula that will work with any number. I am finding the volume of a 3d cross- shape. Here are my results so far:
Term Number 0 1 2 3 4 5
nth term 1 7 25 63 129 231
1rst diff 6 18 38 66 102
2nd diff 12 20 28 36
3rd diff 8 8 8
I can't seem to find a formula that will work with any number. Any help would be much appreciated. Answered by Penny Nom. |
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Three consecutive positive intergers |
2003-02-09 |
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From Yew: Prove that when we multiply any consecutive positive intergers, the result is always divisible by 6.
ex. (7)(8)(9) = 504 = 6 (84) Answered by Penny Nom. |
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AABBBCCCCAABBBCCCC... |
2003-02-09 |
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From Patty: The pattern AABBBCCCCAABBBCCCC continuously repeats. What is the 2003rd letter in the pattern? Please help, I am trying to figure out. Answered by Penny Nom. |
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Millilitres and millimeters |
2003-02-09 |
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From Iwan: I was just wondering whether a millilitre was equal to a millimetre, if not, what is there difference. Answered by Penny Nom. |
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BEDMAS |
2003-02-09 |
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From Stefanie: I do remember the rules of BEDMAS, but for some reason this question puzzles me. 6 X 9 - 3 + 44 I started with the Multiplication 54 - 3 + 44 But then I got stuck, do I proceed with adding the 44 and subtracting the 3 or figure out what -3 + 44 is, but then how would that work with 54?
Answered by Penny Nom. |
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Two investments |
2003-02-07 |
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From A student: you have $7200 in principal and invest different sums @ 10% and 14%. You receive 920 at end of term. (one year)What amounts are invested at what rate? Answered by Penny Nom. |
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The area of an isoceles triangle |
2003-02-07 |
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From A student: I have to find the area of an isoceles triangle with one angle side of 30 degrees, and length of base 5. Could you please help me solve this problem? Answered by Penny Nom. |
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