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How far is it from the top to the bottom of the mountain? |
2008-05-09 |
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From Matthew:
A ski lift carries a skier up a slope at a rate of 2 miles per hour. Following the same path down the mountain, the hiker has a rate of 4 miles per hour. If the round trip took 3 hours, how far is it from the top to the bottom of the mountain?
Answered by Penny Nom. |
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The surface area of a tank |
2008-05-09 |
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From jack:
i'm looking for the square footage of a tank that is 10'diameter x 23'high,floor,ceiling and walls
Answered by Penny Nom. |
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A linear model |
2008-05-09 |
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From Shelby:
How would you write a linear model to represent the population of a city that has a population of 547,725 and a growth rate of -25,195 per year with t represents the number of years since 1994?
Answered by Penny Nom. |
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Rounding |
2008-05-09 |
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From wendell:
write a three digit number that when rounded to the nearest ten and the nearest hundred, the answers are the same
Answered by Penny Nom. |
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Excluded values |
2008-05-09 |
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From Andrew:
Finding Excluded Values
j+1
----
2j-6
Answered by Penny Nom. |
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The volume of a ditch |
2008-05-09 |
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From Dixie:
I need to find the cubic feet of a ditch 36 inches wide by 28 inches high, by 1561 feet long.
then I need to convert it to cubic yards then to tons. of rock
Answered by Penny Nom. |
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A quadrilateral |
2008-05-08 |
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From reena:
two exterior angles quadrilateral are 100 degrees 110 degrees each. two remaing interior one angle twice size other find size of each angle
Answered by Penny Nom. |
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6 things from 45 things |
2008-05-08 |
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From Hakan:
Hi im a student studying advanced mathematics and i would like to know how many
possible sequences of six digits there are using the numbers from 1 to 45 (1 & 45 are
included) but none of the sequences can be identical even if the numbers are in
different orders.
Example : 1,2,3,4,5,6
2,3,4,5,6,1 these two sequences are identical even though the digits have
changed their order so therefore is incorrect.
I would like to know the easiest way to write these sequences along with how
many there are. This is extremely important for my year 12 exams Thank You.
Answered by Penny Nom. |
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How can the distance between two points be irrational? |
2008-05-07 |
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From Dawn:
Yesterday my advanced 7th grade pre-algebra students were finding the distance between two points on a coordinate grid using the distance formula. A student asked me how come we or math I guess is able to represent a finite distance with an irrational number. I found this to be a very interesting question. I and the 7 other math teachers on my staff had discussed this and we have a variety of thing to say to the kid, but nothing that amounts to an actual answer. The students have studied what it means for a number to be irrational, and they cannot understand how that can "measure" a line that obviously stops. Got any suggestions?
Answered by Stephen La Rocque, Penny Nom, Claude Tardif and Victoria West. |
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seven + eight = twelve |
2008-05-07 |
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From evelyn:
My son's teacher has given the children this question to answer and I do not have an anser.
seven + eight = twelve
Answered by Stephen La Rocque. |
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An isosceles triangle |
2008-05-07 |
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From Jay:
Given: An Isosceles Triangle with the area=16m squared. What would be the length of each leg.
Answered by Stephen La Rocque. |
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The sides of an octagon |
2008-05-07 |
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From Frank:
Question from Frank, a parent:
Hi,
Need to lay out a 10 ft. diameter octagon on the ground. What is the
length of the
sides ? And the angles ?
Answered by Harley Weston. |
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The factor theorem |
2008-05-06 |
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From Nomaan:
factorise
x³-2x²-x+2
using factor theorem
Answered by Penny Nom. |
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A net for a hemisphere |
2008-05-06 |
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From Julie:
how would you draw the net of a hemisphere?
Answered by Walter Whiteley. |
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Factor ac^2 - a^3 - a^2b + ab^2 + b^3 - bc^2 |
2008-05-05 |
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From erson:
factorize:
ac^2 - a^3 - a^2b + ab^2 + b^3 - bc^2
Answered by Harley Weston. |
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