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Gallons |
2001-11-19 |
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Shawn pose la question :
Do we use British or American gallons in Canada?
Chris Fisher lui répond. |
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Translated by the vector (-5,2) |
2001-11-19 |
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Jennifer pose la question :
Give the image of (p,q) when translated by the vector (-5,2).
Penny Nom lui répond. |
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The "pi" of a circle in hyperbolic space |
2001-11-19 |
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Alex pose la question :
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.
Walter Whiteley lui répond. |
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Box and Whisker plots |
2001-11-19 |
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Rod pose la question :
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?
Penny Nom lui répond. |
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Renee, Paulo and Peter |
2001-11-18 |
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Sue pose la question :
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.
Penny Nom lui répond. |
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Number sequences |
2001-11-17 |
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Stephanie pose la question :
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, _, _, _.
Penny Nom lui répond. |
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A box of pants and shirts |
2001-11-17 |
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Debbie pose la question :
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.
Penny Nom lui répond. |
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How do you get to 100 by using 6 nines? |
2001-11-17 |
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A student pose la question :
How do you get to 100 by using 6 nines?
Claude Tardif lui répond. |
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Magic squares |
2001-11-17 |
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A student pose la question :
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.
Penny Nom lui répond. |
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Some functions without numbers |
2001-11-16 |
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A student pose la question :
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.
Claude Tardif lui répond. |
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Numbering pages |
2001-11-15 |
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Lucy pose la question :
A printer uses 1008 digits to number the pages of a book. How many pages are there in the book?
Penny Nom lui répond. |
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Negative numbers |
2001-11-15 |
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Jewel pose la question :
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?
Penny Nom lui répond. |
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A clap of thunder |
2001-11-15 |
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Frustrated Mom pose la question :
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).
Claude Tardif and Penny Nom lui répond. |
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what number doubled plus 20 will give you 4/3 the original number |
2001-11-15 |
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Hank pose la question :
what number doubled plus 20 will give you 4/3 the original number
2 x__ + 20 = 4/3 of the original number
Penny Nom lui répond. |
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(a+b) squared and a squared plus b squared |
2001-11-14 |
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Kristen pose la question :
(a+b)2 = a2 + b2 Is this true for all whole numbers, and why?
Penny Nom lui répond. |
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