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Midpoints and endpoints |
2000-02-15 |
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From Jessica Sipes:
I need to know how to find and endpoint using the midpoint and the other endpoint.
Answered by Penny Nom. |
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Weighing bales |
2000-02-15 |
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From Thinh Than:
You have 5 bales of hay. and they were weighed but they didn't weigh them individually, they were weighed in pairs. The pairs were 1&2, 1&3, 1&4, 1&5, 2&3, 2&4, 2&5, and so on. The weights of the pairs were 80,82,83,84,85,86,87,88,90, and 91. Can you tell me how much the bales weigh individually.
Answered by Claude Tardif. |
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Factors |
2000-02-15 |
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From Guy Rayfield:
Please can you tell me the factors of 6 I think the answer is 2 and 3 - am I right?
Answered by Penny Nom. |
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Is a square a rectangle? |
2000-02-15 |
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From Jaireh:
This is something that aroused a debate in class: A rectangle was defined as a parallelogram with 4 right angles. A square was defined as a parallelogram with 4 congruent sides and 4 right angles. I need written and conclusive proof that some rectangles can or cannot be squares. I tried insisting that some of them can.. but without proof nobody will listen.
Answered by Walter Whiteley. |
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The sum of repeating decimals |
2000-02-15 |
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From Caitlin Harris:
Express 0.111... + 0.121212... + 0.123123123... as a repeating decimal and its equivalent fraction. Show work. Also, are there any extensions to this problem? In other words, are there any questions that we could ask that may be related to this problem?
Answered by Penny Nom. |
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Counting to a trillion |
2000-02-06 |
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From Art Keck:
If I counted one dollar every second, would it take 31,000 years to count to a trillion? If not, could you please explain how long it yould take?
Answered by Penny Nom. |
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Ten stools |
2000-02-06 |
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From Haim:
In a cafe with ten stools, three customers want to be seated, so that no two are next to each other. How many ways can this be done? Do not consider it to be a separate seating if two customers switch seats.
Answered by Denis Hanson and Walter Whiteley. |
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A 4-by-4 magic square |
2000-02-06 |
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From Maureen Fitzsimons:
I need to create a 4x4 grid using numbers .1, .2, .3, .4, ....1.1, 1.2, 1.3,1.4,1.5,1.6 the sum of the number diagonally, horizontally and across all equal 3.4
Answered by Penny Nom. |
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Is zero an even or odd number? |
2000-02-06 |
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From Christian Hansen:
On a list I run, someone posted that 02-02-2000 was the first date since 28-08-888 where all the digits were even. Of course, this provoked a discussion of whether zero was odd, or even, or neither. I remember reading that, for symmetry's sake, it is considered by mathematicians to be even. Any thoughts?
Answered by Patrick Maidorn. |
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Percentages with decimals |
2000-02-06 |
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From Andrew Connell:
I need help with these math questions: How does one convert a percent to a fraction when the percent has a decimal (example-86.5%)?
Answered by Penny Nom. |
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Tennis doubles |
2000-02-04 |
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From Brittany Allinson:
Cheri, Beth and Jacinta are daughters of Mr. Sullivan, Mr. Marchand, and Mr. Benoit. Four of these people are playing tennis doubles. Mr. Benoit's daughter and Mr. Sullivan are partners. Cheri's father and Mr. Marchand's daughter are also partners. There aren't any father/daughter combinations. Who is Cheri's father?
Answered by Penny Nom. |
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Filbert Family Circus |
2000-02-04 |
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From Sarah:
As Clyde moves his broom around the circus ring, he thinks that he has finally found a job where he can make a clean sweep of things. Clyde is sweeping the ring where the lions perform in the Filbert Family Circus. The ring is 76 feet across and Clyde is using a broom 3 feet wide. He starts at the outside edge and works his way to the middle, making circles around the ring. After sweeping 3/4 of the ring, Clyde sees the lions coming with their trainer and scurries out of the ring. How many trips around the ring did he make?
Answered by Penny Nom. |
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A 16th century mathematician |
2000-02-04 |
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From Danielle Dombrowski:
My name is Danielle Dombrowski, I am in the 7th grade and my teacher gave us a riddle to figure out which mathemtician we would have to do a report on. The only problem is that I don't know what the answer is. Can you help? The riddle is "This 16th century mathematician, having predicted the day of his death, took poison to make sure it came true. Who is it?"
Answered by Penny Nom. |
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Play ball |
2000-02-03 |
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From Jessie:
Here's a calc question that is probably a lot easier than I am making it. If you have a legendary "baseball problem" for the related rates section of Calc I, and you are given that the runner is running from 2nd to 3rd base at a given rate, and the umpire is standing at home plate, and you are given the distance between the bases on the field, how do you find the rate of change of the angle between the third base line (from the point of the umpire) and the runner? Here is a sample prob: Runner is moving from 2nd to 3rd base at a rate of 24 feet per second. Distance between the bases is 90 feet. What is the rate of change for the angle (theta, as described previously) when the runner is 30 feet from 3rd base?
Answered by Harley Weston. |
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A problem with a radius. |
2000-02-01 |
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From Howard B Davis:
We start a Line that goes up 1 unit, then it goes to the Right for 5 units long, and then goes down 1 unit which is the end point. If we draw a circle that is tangent to both ends as well as the mid-point of the horizontal line: How do we find the radius of the arc; in Mathematics, with only this information?
Answered by Chris Fisher. |
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