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l'équation d'une rotation dans un graphique cartésien |
2001-11-14 |
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Ghaith pose la question :
je d6sir que vous me rafraichissez un peu la mémoire s.v.p. j'aimerai savoir l'équation d'une rotation dans un graphique cartésien merci
Claude Tardif lui répond. |
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Subsets of a countably infinite set |
2001-11-14 |
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Tania pose la question :
How could I show (and explain to my son) that any countably infinite set has uncontably many infinite subsets of which any two have only a finite number of elements in common?
Claude Tardif lui répond. |
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3x-1/2(x-4)+5= -3 |
2001-11-13 |
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Tausa pose la question :
3x-1/2(x-4)+5= -3
Penny Nom lui répond. |
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Inequalities |
2001-11-13 |
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Pat pose la question :
When writing the solution to an inequality, why is the solution written in set notation? {x/ }
Penny Nom lui répond. |
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Prove that the medians of triangle PQR meet in a central point G. |
2001-11-11 |
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Jessica pose la question :
Use a scalene triancle with one point (0,b) on the y axis, another point (2c, 0) on the x-axis and the last point, (2a,0) on the x-axis. Prove that the medians of triangle PQR meet in a central point G.
Penny Nom lui répond. |
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A cubic |
2001-11-10 |
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Louise pose la question :
x3 + 9x2 - 7x - 63
Penny Nom lui répond. |
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1 minus 5(y) equals negative 2 |
2001-11-10 |
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Judy pose la question :
1 minus 5(y) equals negative 2
Penny Nom lui répond. |
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A circle and triangle overlap |
2001-11-09 |
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Tara pose la question :
A circle and triangle overlap as shown.the area of the circle is three times the area of the triangle.If the common region is removed,then the area of the rest of the circle would be 14 sq cm more than the area of the rest of the triangle.How many sq cm are in the area of the complete triangle.
Penny Nom lui répond. |
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A circle and a triangle |
2001-11-09 |
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Tasha pose la question :
I have a circle that has an equalateral triangle inscribed in it. The tip of the triangle (B) is at the center of the circle with the other corners (A & C) extending to the sides of the circle. I need to know the equation to find the linear length of AC. I also need to find the cordial length of the circle from point C to A.
Penny Nom lui répond. |
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Third side of Acute Triangle |
2001-11-09 |
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Don pose la question :
I gave this problem to my children, 9th and 12th grade and they are not(me too!) sure of the answer. I am trying to determine the length of the third side of an acute triangle. I know two of the lengths but I do not know the angles. Is there a proper formula to use to find the length of the third side? Thank you.
Chris Fisher and Penny Nom lui répond. |
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12 pairs playing bridge |
2001-11-09 |
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Diana pose la question :
I have 12 pairs playing bridge against one another for 12 games. I need to have each pair partnered with another pair -- but only once. I'm looking for a schedule for play for all 12 games. They should only be able to play against another team only once also. (ex: 1/2 v 3/4 then 4/2 v 3/1) Thank you for this opportunity to solve my dilemma.
Claude Tardif lui répond. |
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Asymptotes |
2001-11-09 |
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Frank pose la question :
given the function: f(x) = (x2) / (x-1) the correct answer to the limit of f(x) as x approaches infinity is: y = x+1 all math references point to this answer and the method they all use is long division of x-1 into x2 however if one were to multiply both the numerator and denominator by 1/x and then take the limit, one gets: y=x how can the descrepency between the two answers be explained?
Chris Fisher and Penny Nom lui répond. |
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A 3 dimensional 5 pointed star |
2001-11-08 |
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Kent pose la question :
I am looking for a formula that will give me a layout for a 3 dimensional 5 pointed star. I want to form it out of sheet metal, using 5 polygons and soldering them at the apex. Can you please help me with this? I would like to be able to give the formula the height of the star from the bottom two points to the top point and also how deep the star is. Thank you very much!
Judi McDonald lui répond. |
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Manufactures golf balls |
2001-11-06 |
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Kevin pose la question :
A company manufactures golf balls. Golf balls are each numbered consecutively 0 to 4, and then the numbering starts over with zero again. Every 12th golf ball is yellow. Every 8th golf ball is tested for defects. The company produces 120,000 golf balls in an eight-hour shift. A. How many yellow golf balls are tested for defects during the day? Explain your reasoning. B. How many of these yellow balls that are tested are imprinted with the numeral 2? Explain your reasoning.
Penny Nom lui répond. |
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Counting CD's |
2001-11-06 |
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Jason pose la question :
An older brother said to his younger brother, "Give me 8 of your CDs, then I will have twice as many as you." The younger brother replied, "No, you give me 8 of yours instead, and then we'll have an equal number." How many CDs does each boy have?
Chris Fisher lui répond. |
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