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Complements and supplements |
2007-08-31 |
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From Gretchen:
An angle is its own complement. Find the measure of a suppllement to this angle.
Answered by Stephen La Rocque. |
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A turtle tank |
2007-08-30 |
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From Natasha:
I have a tub that we are going to use for a turtle tank. it is 3 feet long 1foot 7in wide and 1foot 5 in deep. how many us gallons will this tub hold?
Answered by Harley Weston. |
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Exponential form |
2007-08-29 |
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From Emily:
Write the Exponential Form of 125 x 25 and 81 x 27.
Answered by Stephen La Rocque. |
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The digital lock for a cell phone |
2007-08-29 |
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From Hollie:
i have a four digit lock code on my cell phone and cannot remember what it is. i know that it does not contain a 2 or a 4 and none of the numbers are repeated. the numbers range from 0 to nine and the only way to figure out what the code is, is to try randomly. I was wondering if you could give me a list of possible combinations using the information i gave you to make it easier to crack the code.
Answered by Penny Nom. |
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Rotational energy needs |
2007-08-29 |
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From will:
how much energy in KW do i need to start and subsequently rotate a 4 ton fly wheel of 1 metre radius at 12 rpm?
Answered by Stephen La Rocque. |
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Similar triangles |
2007-08-29 |
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From James:
Question: In the triangle ABC, X is a point on AC. AX = 15 m and XC = 5 m. The angle AXB is 60 degrees and the angle ABC is 120 degrees. Find the length of BC.
I am sure to an extent that this has to do with similar triangles, but I am not certain.
Answered by Harley Weston. |
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A quadrilateral problem |
2007-08-29 |
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From James:
The sides BC and AD of a quadrilateral ABCD are parallel. X is the midpoint of AB. The area of ABCD is Y. Find the area of the triangle CXD in the terms of Y.
Answered by Harley Weston. |
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Percentage differences |
2007-08-29 |
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From Camilla:
If a store sells a certain syle of skirt, an in the first week they sell 13,
in the second week 20, in the third week 17 and in the fourth week 23, calculate the percentage
difference between the highest and the lowest weekly sale.
Answered by Stephen La Rocque and Harley Weston. |
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Induction problem (divisible by 11) |
2007-08-29 |
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From James:
Show that 27 * (23 ^ n) + 17 * (10 )^ (2n) is divisible by 11 for all positive integers n.
Answered by Stephen La Rocque and Penny Nom. |
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Fractions, ratios and percentages all mixed together |
2007-08-29 |
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From Charon:
Example:
x : 1/4% :: 9 3/5 : 1/200
Answered by Stephen La Rocque. |
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2,6,7,21,22,66,67 |
2007-08-28 |
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From EDWIN:
this doesnt make any sense to me....... i cant find the pattern...
2,6,7,21,22,66,67
Answered by Leeanne Boehm and Stephen La Rocque. |
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The number of minutes in n hours |
2007-08-28 |
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From sharquea:
the number of minutes in n hours
Answered by Leeanne Boehm and Stephen La Rocque. |
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Question |
2007-08-28 |
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From Reneilwe:
Above is a plan of a house. The scale is 1 cm = 0,8 metres.
3.1 Describe briefly the rooms you come to as you go through the front door
and down the passage. Say whether each room is on your left, right, ahead,
etc
3.2 Find the actual dimensions of the bathroom (length and breadth)
3.3 Give the length of the passage in metres.
3.4 Give the area of a carpet needed to cover the passage
3.5 A child is in the lounge, at the door into the passage. He pushes a toy
car, and it take 2 seconds to go from one end of the passage to the other.
Calculate the speed at which the car travels, first in metres per second,
then in kilometres per hour. Give the answer correct to 1 decimal place.
Answered by Penny Nom. |
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Counting stitches and changing units |
2007-08-28 |
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From Lim:
Jack is making stuffed toys. Each toy needs 360 stitches. Ten stitches take 15 seconds.One toy needs
57cm of cotton for stitches. How many centimetres of cotton does Jack use in an hour?
Answered by Stephen La Rocque. |
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Factor completely 2x^2-3x-5 |
2007-08-28 |
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From melissa:
how do you factor this completely:
2x^2-3x-5
Answered by Stephen La Rocque and Penny Nom. |
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