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Octagonal panels for a horse pen |
2009-03-25 |
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From Tony:
I am building a pen for my horse. I am going to use 12' panels in the shape of an octagon. How many feet will he have from side to side using 12' panels.
Thanks,
Tony
Answered by Robert Dawson and Penny Nom. |
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0123456789 |
2009-03-25 |
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From Dr.:
Many years ago I discovered that there are 33 numbers which,
when multiplied by 0123456789, simply rearrange the digits. Surprisingly
(to me at least) is the fact that the digits of all of those 33 numbers add up
to one of the 6 "cardinal" numbers 1, 2, 4, 5, 7, and 8. For example
6 + 2 = 8 and 62 X 0123456789 = 7654320918 etc.
Another interesting (to me) fact is that only the cardinal numbers
1, 2, 4, 5, 7, and 8 rearrange the digits in the number 9876543210.
My question is: "Is this known to anyone but me and the people I have
told?"
Answered by Robert Dawson. |
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More on mills |
2009-03-25 |
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From Kenneth:
If I want to express 13 mills as a decimal part of $1.00, the answer
is $0.013. This amount is found by dividing 13 mills by 1000
mills/$1.00.
Can 13 mills be expressed as a decimal part of another amount instead
of $1.00? For example, express 13 mills as a decimal part of $1.50
or express 13 mills as a decimal part of $0.10. What would these
amounts be?
Answered by Robert Dawson. |
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The rate of change of the volume of a sphere |
2009-03-25 |
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From Kaylin:
why the rate of change of volume of a sphere is not constant even though dr/dt is constant?
Answered by Walter Whiteley. |
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x^2/5 - 4/5 = -3/5x |
2009-03-25 |
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From Lorrie:
x^2/5 - 4/5 = -3/5x
Answered by Penny Nom. |
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Z-score |
2009-03-25 |
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From Barb:
I am having trouble finding information on a z score and the conversion to the number of standard deviations a z value can be away from the mean.
What exactly does that mean and what am I looking for?
Help Please.
Answered by Harley Weston. |
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The optimal retail price for a cake |
2009-03-25 |
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From Shawn:
Your neighbours operate a successful bake shop. One of their specialties is a cream covered cake. They buy them from a supplier for $6 a cake. Their store sells 200 a week for $10 each. They can raise the price, but for every 50cent increase, 7 less cakes are sold. The supplier is unhappy with the sales, so if less than 165 cakes are sold, the cost of the cakes increases to $7.50. What is the optimal retail price per cake, and what is the bakeshop's total weekly profit?
Answered by Robert Dawson. |
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Dividing by fractions |
2009-03-25 |
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From Mitch:
-2 divided by -2/3 = ??
Answered by Penny Nom. |
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A max-min problem |
2009-03-24 |
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From Jay:
Determine the area of the largest rectangle that can be inscribed between the x-axis and the curve defined by y = 26 - x^2.
Answered by Harley Weston. |
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Comparing positive and negative fractions |
2009-03-24 |
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From Christyrose:
Hello. I am a sixth grade math student and i need help on how to compare negative and positive fractions.
Here is is:
3/4 -2/3 7/10 -5/6
I'm not sure how to do the negative parts because i was absent for a couple days. Thank you!
Christyrose
Answered by Penny Nom. |
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Ranking 6 players from 49 |
2009-03-24 |
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From liz:
My daughter is having problems with this question,
if you had to match 6 players in the correct order for most popular outfielder from a pool of professional players numbered 1 through 49 , how many possibilities are there?
Answered by Penny Nom. |
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Choosing a 4 digit number at random |
2009-03-24 |
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From shabkhal:
If a four-digit number is chosen at random, what is the probability that the product of the digits is 12.
Answered by Harley Weston. |
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The diameter of a roll of plastic |
2009-03-24 |
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From truong:
hi. i have trouble to calculate the diameter of the plastic roll. the sheet is 765 m long and 0.8 mm to wrap around the core 400 mm in dia. please help me with the formula to calculate the dia of plastic roll, thanks in advance
Answered by Harley Weston. |
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An infinite number of solutions |
2009-03-24 |
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From Sean:
this is a linear equations problem;
first:
3535.5 + Fbd (.866) + Fbc (.5) - Fab (.5) = 0
and
-3535.5 - Fab (.866) - Fbc (.5) - Fbd (.5) = 0
Answered by Harley Weston. |
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The height of a mountain peak |
2009-03-23 |
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From james:
Can you please help us (my son Jim geometry) out with this problem, we
cannot seem to find the correct method of solving, not sure how to solve the
scalene triangle with what is given...if that's the correct method?? Can you
please explain how this is solved!!
Thank you so much,
Jim and son !
Answered by Harley Weston. |
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