 |
|
|
|
|
|
|
|
|
Octagonal panels for a horse pen |
2009-03-25 |
|
Tony pose la question :
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
Robert Dawson and Penny Nom lui répond. |
|
|
|
|
|
|
0123456789 |
2009-03-25 |
|
Dr. pose la question :
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?"
Robert Dawson lui répond. |
|
|
|
|
|
|
More on mills |
2009-03-25 |
|
Kenneth pose la question :
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?
Robert Dawson lui répond. |
|
|
|
|
|
|
The rate of change of the volume of a sphere |
2009-03-25 |
|
Kaylin pose la question :
why the rate of change of volume of a sphere is not constant even though dr/dt is constant?
Walter Whiteley lui répond. |
|
|
|
|
|
|
x^2/5 - 4/5 = -3/5x |
2009-03-25 |
|
Lorrie pose la question :
x^2/5 - 4/5 = -3/5x
Penny Nom lui répond. |
|
|
|
|
|
|
Z-score |
2009-03-25 |
|
Barb pose la question :
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.
Harley Weston lui répond. |
|
|
|
|
|
|
The optimal retail price for a cake |
2009-03-25 |
|
Shawn pose la question :
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?
Robert Dawson lui répond. |
|
|
|
|
|
|
Dividing by fractions |
2009-03-25 |
|
Mitch pose la question :
-2 divided by -2/3 = ??
Penny Nom lui répond. |
|
|
|
|
|
|
A max-min problem |
2009-03-24 |
|
Jay pose la question :
Determine the area of the largest rectangle that can be inscribed between the x-axis and the curve defined by y = 26 - x^2.
Harley Weston lui répond. |
|
|
|
|
|
|
Comparing positive and negative fractions |
2009-03-24 |
|
Christyrose pose la question :
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
Penny Nom lui répond. |
|
|
|
|
|
|
Ranking 6 players from 49 |
2009-03-24 |
|
liz pose la question :
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?
Penny Nom lui répond. |
|
|
|
|
|
|
Choosing a 4 digit number at random |
2009-03-24 |
|
shabkhal pose la question :
If a four-digit number is chosen at random, what is the probability that the product of the digits is 12.
Harley Weston lui répond. |
|
|
|
|
|
|
The diameter of a roll of plastic |
2009-03-24 |
|
truong pose la question :
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
Harley Weston lui répond. |
|
|
|
|
|
|
An infinite number of solutions |
2009-03-24 |
|
Sean pose la question :
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
Harley Weston lui répond. |
|
|
|
|
|
|
The height of a mountain peak |
2009-03-23 |
|
james pose la question :
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 !
Harley Weston lui répond. |
|
|
