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Number sequences |
1999-11-11 |
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From Justin Schessler:
I CAN NOT figure out this sequence or how we continue this sequence... 3,2,6,5,15,14,___,___,___
Answered by Chris Fisher and Harley Weston. |
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logarithme neperien |
1999-11-10 |
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From Louise Kieffer:
D'où provient la valeur e ( 2,7....) des logarithmes népériens ?
Answered by Claude Tardif. |
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Body part measurements |
1999-11-10 |
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From V Bailey:
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.
Answered by Penny Nom. |
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Linear models |
1999-11-09 |
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From Helen Moreno:
What is a linear model?
Answered by Harley Weston. |
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Multiple step problems |
1999-11-09 |
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From Maria Rainsdon:
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.
Answered by Penny Nom. |
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15 films |
1999-11-09 |
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From Hebert:
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:
- ...
Answered by Claude Tardif. |
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Parabolic mirrors |
1999-11-07 |
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From Andy White:
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?
Answered by Penny Nom. |
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Mean, median and mode |
1999-11-06 |
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From Rick:
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.
Answered by Penny Nom. |
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Crossing number |
1999-11-06 |
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From Christian:
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!
Answered by Denis Hanson. |
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Division/Fractions |
1999-11-06 |
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From Azmat Hussain:
Is there a way to explain division by fractions using patterns? For example 3 divided by one half.
Answered by Chris Fisher and Penny Nom. |
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Nines and ones |
1999-11-05 |
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From Greg Miller:
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?
Answered by Claude Tardif. |
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Three numbers |
1999-11-03 |
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From Walter:
Three whole numbers , when added two at a time,yield the sums 75, 111, and 128. Find the smallest of these three whole #'s.
Answered by Penny Nom. |
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Transforming a triangle |
1999-11-02 |
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From Wilder Maldonado:
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.
Answered by Penny Nom. |
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Trolls and Gargoyles |
1999-11-02 |
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From TexGrimm:
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?
Answered by Penny Nom. |
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Inverses of functions |
1999-11-01 |
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From Leanne Hickey:
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.
Answered by Penny Nom. |
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