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A strip of land |
2010-09-15 |
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From Walter:
How many linear feet of strip of land 15 feet wide does it take to make 1 acre?
Answered by Penny Nom. |
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La racine carrée et l'exposant une demie |
2010-09-14 |
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From Alain:
Bonjour.
Je cherche une explication sur l'équivalence entre les exposants
fractionnaires et les racines nième.
Par exemple, comment prouve-t'on que la racine carrée correspond à
l'exposant une demie?
merci
Answered by Pierre-Louis Gagnon et Claude Tardif. |
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Two numbers |
2010-09-14 |
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From Sania:
math homework help-Felicia is thinking of two numbers. One of them is 2 more than 3 times the other one. The difference between the squares of these numbers is 112. What is the smaller number?
Answered by Penny Nom. |
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The nth term |
2010-09-14 |
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From Anna:
The problem is 2n-2. find the nth term. I'm lost as how to even begin
Answered by Penny Nom. |
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Choose any three digits that are less than ten |
2010-09-12 |
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From cecille:
my son have a homework, but i don't understand the question. here's the problem:
choose any three digits that are less than ten.
make all the two digit number you can using those three digits.
add up the two digit numbers you created and divided by the
sum of the original three digits.
record your answer. then do it again with another three digits. write your observation about
the answer.
Answered by Claude Tardif. |
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The length of a vector |
2010-09-12 |
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From kyrie:
Find the possible values of the constant a such that
| ai + 4aj + 4k | = 13
I know the answer is 3 but not sure how to get to it
Answered by Penny Nom. |
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Two perpendicular chords |
2010-09-11 |
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From edwin:
two perpendicular chords AB and CD intersect at P. if X,Y are their midpoints and M the centre of the circle, prove that MP=XY. I do not a have clue on how to do it so can you please help me with it
Answered by Robert Dawson. |
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(5xy)^5 |
2010-09-10 |
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From ana:
(5xy)^5
Answered by Penny Nom. |
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An algebraic equation with fractions |
2010-09-10 |
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From leah:
If 6/x - (x-1)/2 = 4
then the LCD is 2x, right?
so you get 12/2x - (x2-x)/2x = 8x/2x, right?
then what do you do with the 2x when you turn it into a quadratic equation?
Answered by Penny Nom. |
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How many cubic metres of water can safely be stored in the tank? |
2010-09-10 |
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From susanna:
This water tank is a perfect sphere with an inner radius of 12 metres. However, they used inferior materials to build the water tank, and the tank can only withstand a water pressure of 185 kiloPascals. Assume the density of water is exactly 1000 kg/m3, gravity is 9.8 metres/s2, and disregard atmospheric pressure.
How many cubic metres of water can safely be stored in the tank? Round DOWN to the nearest whole number (since rounding up could be catastrophic in this instance!), and please submit only a number with no other information.
Answered by Robert Dawson. |
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Mrs. Johns graded 121 math tests. |
2010-09-10 |
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From Tums:
Mrs. Johns graded 121 math tests. It took her 3 hours to grade all of the tests. Each test took the same amount of time to grade. About how many test did Mrs. Johns grade in 2 hours?
Answered by Penny Nom. |
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A building and a flag pole |
2010-09-09 |
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From paul:
A flag pole and a building stand on the same horizontal level. From the point p at the bottom of the building,the angle of elevation of the top t of the flag pole is 65 degrees. From the top q of the building the angle of elevation of the point t is 25 degrees.If the building is20 meters high. Calculate the distance pt
Answered by Penny Nom. |
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Arrays |
2010-09-09 |
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From Susan:
I'm a lawyer but evidently incredibly stupid at 4th grade math. . . .Question: cover a tabletop with 9 rows of square tiles with 9 squares in each row. How many tiles cover the tabletop? Then, the paper shows a 9x9 array and asks how it is used to solve the problem. My daughter wrote 9x9=81. The next question is "what are the products of the two smaller arrays?" ???? There are no other arrays - are we to make smaller arrays from the 9x9? how?
Answered by Robert Dawson. |
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A logarithmic equation |
2010-09-08 |
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From Rohit:
x^2 + k*ln(x) - c - k = 0
Where k and c are constants.
Answered by Penny Nom. |
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Decimal form |
2010-09-08 |
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From Tracy:
What is the decimal form of 0.14 x 10 the the first power?
Answered by Penny Nom. |
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