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A theorem involving a trapezoid |
2004-09-29 |
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From Abraham:
Given:Trapezoid ROSE with diagonals RS and EO intersecting at point M
Prove:Diagonals RS and EO do not bisect each other.
Answered by Harley Weston. |
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The area of a lot |
2004-09-29 |
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From Deb:
I am trying to figure out how many square feet are in a piece of property. Start at Point A-then go 140 feet north-then 100 feet due east-then 300 feet at an angle southeast so that connecting to point A would be a straight line (right angle to first line north.)
Answered by Penny Nom. |
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Visitor wins or home wins |
2004-09-29 |
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From Paavn and Laddi:
I have a math question i am stumped on for one of my classes. The question states that there are 14 baseball games with 2 possible outcomes for each game, visitor win or home win. How many different total combinations are possible from the 14 games?
Answered by Penny Nom. |
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Cubic yards of concrete |
2004-09-29 |
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From Tanya:
We are starting up a new business and for the business we will be required to order concrete for various shapes. Right now we have a job that requires a concrete slab that a decagon it is 140-3/4" from flat side to flat side, 74" from point to center and each flat side is 46" The pad should be 4" thick with 12"x12" continuous footing.
Answered by Harley Weston. |
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The area of a lot |
2004-09-28 |
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From Stan:
I own a parcel of land (lot 20) that is assessed at 9127.00 square feet and has a frontage of 99.90 feet according to the tax roll. I don't know how large my property actually is since I feel that the tax assessment and the survey map don't jive
Answered by Harley Weston. |
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A palindrome question |
2004-09-28 |
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From Lilly:
12, 21, 13, and 31 are the only double-digit numbers whose squares are the palindromes of the squares of the palindromes of double-digit numbers. I was wondering why it works for these numbers, and if only these numbers work this way.
Answered by Chris Fisher and Penny Nom. |
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The length of a rectangle |
2004-09-26 |
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From Rebecca:
My question is each side of a square S is 18 inches long and the area of S is at least 3 times the area of a rectangle that is 9 inches wide. What is the greatest possible length in inches of the rectangle?
Answered by Penny Nom. |
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37% |
2004-09-26 |
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From Andrew:
how do we change 37% into a fraction
Answered by Penny Nom. |
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Grams to milliliters |
2004-09-25 |
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From Emily:
I am trying to convert 19.5g into mL assuming that it's water; density=1g/mL. I don't know where to begin.
Answered by Penny Nom. |
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A parallelepiped |
2004-09-25 |
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From Aman:
" If OA, OB, and OC are three edges of a parallelepiped where O is (0,0,0), A is (2,4,-2), B is (3,6,1), and C is (4,0,-1), find the coordinates of the other vertices of the parallelepiped.)"
Answered by Penny Nom. |
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The last digit of 2^28 |
2004-09-25 |
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From A student:
I am currently enrolled in a math reasoning class and a math question I have to answer is determine the units digit in 3 28power. When I set up a table and keep cubing the numbers, I find a pattern with the last digits of the numbers that follow 1,3,9,7. My calculator gets to about the 19th power, and then I get an error. If I continued the pattern, would the units digit then be the last digit of 3 28th power, which would be a 7? Please let me know if I am solving this correctly and what a unit's digit actually is.
Answered by Penny Nom. |
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Rational expressions |
2004-09-24 |
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From A student:
In general, I understand rational expressions except when it comes to solving problems such as:
x+y/2x-y - 2x/y-2x or m-4/3m-4 + 3m+2/4-3m
I am confounded by the issue of having to find a common denominator. For example, if I tried to solve these problems by multiplying both denominators they would still be uncommon.
Answered by Claude Tardif. |
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Supplementary angles |
2004-09-23 |
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From Rosemary:
Is the term supplementary angles only applicable to 2 angles (ie. a pair of angles) or can it be used when talking about 3 or more angles that add to make 180 degrees?
Answered by Penny Nom. |
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Incremental variance |
2004-09-23 |
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From Carlos:
I must keep statistical data (mean and variance) in 3 granularity levels depending on the age of the data (daily for older than 1 year, hourly for older than 1 month and quarter-hour for older than 1 day). How can I calculate the resulting variance from a set of variances previously calculated supposing I have the count and mean for each member of the set?
Answered by Andrei Volodin and Penny Nom. |
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The volume of a pile of mulch |
2004-09-22 |
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From Sam:
Is there a formula to determine the cubic feet of something in a pile. IE- I need to determine the cubic feet of a pile of mulch. The pile comes to a peak, so the length and width decrease as the pile increases.
Answered by Penny Nom. |
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