 |
|
|
|
|
|
|
|
|
Rounding |
2007-11-05 |
|
From Charles:
I have been asked to explain why rounding to 3 decimal places
has become the adopted industry standard in mathematics for
showing measurement calculations. I understand that it makes
sense to round financial calculations to 2 d.p. because then it's
rounded to the nearest penny (or cent) but why would the standard
in measurement be 3?
Answered by Stephen La Rocque. |
|
|
|
|
|
|
Six crates of cantaloupes |
2007-11-05 |
|
From BARBARA:
The average weight 6 crates of cantaloupes is 61 lbs, if 3 of the crates weigh 72, 59, and 70 lbs. which of the following could be the weight in pounds of the other 3 crates?
a. 49,59,60
b. 51,53,54
c. 53,57,58
d. 54,56,60
e. 57,57,57
Answered by Stephen La Rocque and Penny Nom. |
|
|
|
|
|
|
Great circles |
2007-11-05 |
|
From Lindsay:
Does a sphere have only ONE great circle? Explain?
Answered by Stephen La Rocque. |
|
|
|
|
|
|
Two cars |
2007-11-04 |
|
From Jalisa:
If Car "A" is traveling 50 miles per hour and car "B" is traveling 60 miles per hour, how long will it take car "B" to catch up to car "A" if car "A" had a 15 mile head start.
Answered by Penny Nom. |
|
|
|
|
|
|
The height of a triangle |
2007-11-03 |
|
From William:
I need to find the height of a triangle if the base is 15, one side is 14 and the other side is 13.
Answered by Stephen La Rocque and Penny Nom. |
|
|
|
|
|
|
Return on investment |
2007-11-02 |
|
From Julie:
Hi - I'm trying to figure out what my ROI ( Return on my investment) is for a particular product I purchased. My investment cost was $4100 and my savings as a result of this investment was $34,170. How can I figure out what my ROI was on this product. Thanks much for your help!
Answered by Penny Nom. |
|
|
|
|
|
|
Chris has twice as many $1 bills as pennies |
2007-11-02 |
|
From vicky:
Chris has twice as many $1 bills as pennies, twice as many dimes as he has $10 bills, and twice as many pennies as he has dimes. How much money does he have?
Answered by Penny Nom. |
|
|
|
|
|
|
Stem & Leaf Plots |
2007-11-02 |
|
From Jen:
Trying to help my Gr.4 son with his math and i am a little lost here are the
stem and leaf plots..
Stem Leaves
4 02
3 1226699
2 011255789
1 33357899
Stem Leaves
2 00011111223334455
1 range566788899
Question - How are the ranges for the stem & leaf plots different ?
Answered by Penny Nom. |
|
|
|
|
|
|
I have a piece of material 44 inches by 78 inches |
2007-11-02 |
|
From Marianne:
I have a piece of material 44 inches by 78 inches. How many linear yards can I get from it?
Answered by Penny Nom. |
|
|
|
|
|
|
Convert a diameter of a pencil into centimeters |
2007-11-02 |
|
From Kaitlyn:
I need to convert a diameter of a pencil into centimeters, but how many
diameters are in a centimetres? Thanks =)
Answered by Penny Nom. |
|
|
|
|
|
|
A right angle triangle |
2007-11-02 |
|
From PRAIMNAUTH:
In a right angle triangle , knowing one angle (90 degree ) and the length of the base, how can you calculate the hight and the hypotenuse ?
Answered by Penny Nom. |
|
|
|
|
|
|
Completing the square |
2007-11-01 |
|
From Mark:
An architect is designing a museum entranceway in the shape of a parabolic arch represented by the equation y = -x2 + 20x, where 0 x 20 and all dimensions are expressed in feet. Determine the maximum height, in feet, of the arch.
Answered by Stephen La Rocque. |
|
|
|
|
|
|
Questions of the Month |
2007-11-01 |
|
From Judith:
Where would I find comprehensive questions, that cover the majority of skills in a unit such as number sense, to use as "Questions of the Month"?
Answered by Victoria West. |
|
|
|
|
|
|
The area of a regular pentagon |
2007-11-01 |
|
From sarah:
i'm trying to find the area of a regular pentagon with 200m sides, ive split it into 5 triangles so i dont know either sizes of the lengths and i need to find the height!
how?
Answered by Penny Nom. |
|
|
|
|
|
|
How many combinations can there be for 12 games? |
2007-11-01 |
|
From Melissa:
I am looking to find out how many different combinations there are in 12
sports games. Let's say I have 12 baseball games, total 24 teams, and
there can only be two results, win or lose, no ties. How many
combinations can there be for 12 games? Thank-you very much.
Answered by Penny Nom. |
|
|
