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Number sequences |
1999-11-11 |
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Justin Schessler pose la question : I CAN NOT figure out this sequence or how we continue this sequence... 3,2,6,5,15,14,___,___,___ Chris Fisher and Harley Weston lui répond. |
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logarithme neperien |
1999-11-10 |
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Louise Kieffer pose la question : D'où provient la valeur e ( 2,7....) des logarithmes népériens ? Claude Tardif lui répond. |
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Body part measurements |
1999-11-10 |
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V Bailey pose la question : I am a kindergarten teacher and mother of a 6th grader who wants to do a science project on the correlations of body part measurements. We heard this on the radio and it sparked our interest, but now I cannot find any information about it. Examples are: your height is supposed to equal the distance from fingertip to fingertip when your arms are outstretched. Your foot size is supposed to equal the distance from your wrist to your elbow. Please help me find more information on this topic. Penny Nom lui répond. |
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Linear models |
1999-11-09 |
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Helen Moreno pose la question : What is a linear model? Harley Weston lui répond. |
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Multiple step problems |
1999-11-09 |
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Maria Rainsdon pose la question : I don't understand how to solve these multiple step problems. I wasn't there when my teacher explained it and I am really lost. Here is one of the probs I don't understand: 3m+6=-m-6. Penny Nom lui répond. |
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15 films |
1999-11-09 |
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Hebert pose la question : Un touriste revient de vacnces avec 15 films: - 2 films de photos d 'Italie
- 8 films de photos de Grèce
- 5 films de photos de Turquie.
Aucune marque distinctive ne permet d'identifier les films. Pour des raisons financières le touriste ne fait développer à son retour que 11 de ces 15 films qu'il choisit au hasard.NB : on donnera les résultats sous forme décimale approchée à 10-4 près. - Combien y a t il de choix différents possibles de 11 films parmi les 15 ?
- Quelle est la probabilité que , parmi les 11 films développés, il y ait:
- ...
Claude Tardif lui répond. |
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Parabolic mirrors |
1999-11-07 |
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Andy White pose la question : I am working on a project concerning parabolic mirrors. I need to create a mirror to focus sunlight on a focal point, but I don't know how to do it. Is there some equation that tells where a focal point will be in relation to a parabola? What is a directrix? Penny Nom lui répond. |
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Mean, median and mode |
1999-11-06 |
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Rick pose la question : I have five number places and the mean and median are both "0". The mode is greater than the mean. The sum of the absolute values of all of the numbers is 20. The smallest number is 4 less than the next smallest number. What are the five numbers. (negative integers can be used) All of the numbers are integers. Penny Nom lui répond. |
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Crossing number |
1999-11-06 |
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Christian pose la question : The crossing number of a graph G, denoted cr(G) is defined to be the minimum number of (pairwise) crossings of edges among all drawings of the graph in the plane. For example, cr(K5)=1 and cr(K3,3)=1. What is cr(K7,7)? I figured out that the answer is 81. Now I am trying to figure out if K7,7 can be drawn in the plane with less than 81 crossings? I'm not sure how to approach this one. Other than actually drawing it out and checking by trial and error, I am not sure how to approach this problem. Please help! Denis Hanson lui répond. |
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Division/Fractions |
1999-11-06 |
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Azmat Hussain pose la question : Is there a way to explain division by fractions using patterns? For example 3 divided by one half. Chris Fisher and Penny Nom lui répond. |
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Nines and ones |
1999-11-05 |
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Greg Miller pose la question : Using the numbers 1, 1, 9, 9, only once each, how can I create an expression that equals 10 using only the basic functions of addition, subtraction, multiplication, division, and/or parentheses? Claude Tardif lui répond. |
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Three numbers |
1999-11-03 |
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Walter pose la question : Three whole numbers , when added two at a time,yield the sums 75, 111, and 128. Find the smallest of these three whole #'s. Penny Nom lui répond. |
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Transforming a triangle |
1999-11-02 |
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Wilder Maldonado pose la question : The height, H, of a triangle is increased by a lenth M, How much must be subtracted from the corresponding base,b, so that the area of the new triangle is one-half that of the original triangle. Penny Nom lui répond. |
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Trolls and Gargoyles |
1999-11-02 |
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TexGrimm pose la question : How can you seat 6 monsters - 3 Trolls and 3 Gargoyles- at a circular table if the trolls look alike and the gargoyles look alike? Does your formula work for 9 monsters - 4 trolls and 5 gargoyles? Penny Nom lui répond. |
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Inverses of functions |
1999-11-01 |
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Leanne Hickey pose la question : Let f(x) = 2x2 -3x + 2. Find f-1(4) given the fact that f(2) = 4. So the question is finding the inverse of 4, he said it's easier than it looks. Penny Nom lui répond. |
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