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Gallons |
2001-11-19 |
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From Shawn:
Do we use British or American gallons in Canada?
Answered by Chris Fisher. |
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Translated by the vector (-5,2) |
2001-11-19 |
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From Jennifer:
Give the image of (p,q) when translated by the vector (-5,2).
Answered by Penny Nom. |
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The "pi" of a circle in hyperbolic space |
2001-11-19 |
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From Alex:
How can you find the "pi" of a circle in hyperbolic space (or is it the same). I would like to know because our environment is hyperbolic and if the "pi" of hyperbolic space is irrational, it would follow that space is non discrete. I would greatly appreciate any help in this question.
Answered by Walter Whiteley. |
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Box and Whisker plots |
2001-11-19 |
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From Rod:
In our Prealgebra course, we have been studying Box and Whisker plots. Recently, we learned how to decide whether a data point is an outlier or not. The book (Math Thematics, McDougall Littell) gave a process by which we find the interquartile range, then multiply by 1.5. We add this number to the upper quartile, and any points above this are considered to be outliers. We also subtract the number from the lower quartile for the same effect. My question: where does this 1.5 originate? Is this the standard for locating outliers, or can we choose any number (that seems reasonable, like 2 or 1.8 for example) to multiply with the Interquartile range? If it is a standard, were outliers simply defined via this process, or did statisticians use empirical evidence to suggest that 1.5 is somehow optimal for deciding whether data points are valid or not?
Answered by Penny Nom. |
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Renee, Paulo and Peter |
2001-11-18 |
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From Sue:
Renee is 5 years older than Paulo. she is also 7 years older than Peter. The sum of their ages is 21. How old is each person.
Answered by Penny Nom. |
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Number sequences |
2001-11-17 |
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From Stephanie:
My name is Stephanie. My grade 7 math class is studying number sequences and, to me, they make almost no sense at all. Here I wrote down 2 of the many problems I have for homework and was wondering if you could explain them to me (I have to find the next 3 numbers in each sequence.) It would be a big help! 10, 14, 18, 22, _, _, _. 12, 21, 39, 75, _, _, _.
Answered by Penny Nom. |
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A box of pants and shirts |
2001-11-17 |
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From Debbie:
I need to determine the volume of a box that is 4'HX4'WX4'L. The box contains uniform pants and uniform shirts. I need to know how many shirts and pants are in the box. When folded, the uniform shirt is .5 inches thick. The pants are also .5 inches thick.
Answered by Penny Nom. |
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How do you get to 100 by using 6 nines? |
2001-11-17 |
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From A student:
How do you get to 100 by using 6 nines?
Answered by Claude Tardif. |
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Magic squares |
2001-11-17 |
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From A student:
7th grader wanting to find solution to magic square:
place the integers from -5 to +10 in the magic square so that the total of each row, column, and diagonal is 10. The magic square is 4 squares x 4 squares.
Answered by Penny Nom. |
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Some functions without numbers |
2001-11-16 |
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From A student:
I have a worksheet that is about functions. It doesn't only use numbers. I need help to figure out the function and the solution to how the answer is solved.
Answered by Claude Tardif. |
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Numbering pages |
2001-11-15 |
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From Lucy:
A printer uses 1008 digits to number the pages of a book. How many pages are there in the book?
Answered by Penny Nom. |
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Negative numbers |
2001-11-15 |
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From Jewel:
If zero means nothing or an empty set, then how can a number be less than zero, as in negative number? My understanding of negative numbers is distance from a set point in a given direction. Thus having a negative and positive side of a line is arbritary and is related to displacement rather than value. Am I in error?
Answered by Penny Nom. |
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A clap of thunder |
2001-11-15 |
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From Frustrated Mom:
While getting a recipe for the Thanksgiving feast. The teacher was talking on the phone with a friend who lives four miles north of her. She saw a flash of lightning through the window: fifteen seconds later, she heard a clap of thunder. Ten seconds after that she heard the thunder over the phone. Where did the lightning strike in relation to the teacher's house. (There are two possible answers. Sound travels about 1/5 mile per second. Some people say it's not good to be on the phone in a thunderstorm).
Answered by Claude Tardif and Penny Nom. |
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what number doubled plus 20 will give you 4/3 the original number |
2001-11-15 |
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From Hank:
what number doubled plus 20 will give you 4/3 the original number
2 x__ + 20 = 4/3 of the original number
Answered by Penny Nom. |
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(a+b) squared and a squared plus b squared |
2001-11-14 |
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From Kristen:
(a+b)2 = a2 + b2 Is this true for all whole numbers, and why?
Answered by Penny Nom. |
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