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Lottery Problem |
2007-11-18 |
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A lottery problem pose la question : There are 50 numbers in a Lottery Draw and 5 numbers are drawn out. The player chooses 5 numbers can you tell what is the lowest number of entries required to guarantee that 3 of the 5 numbers entered match 3 of the 5 numbers drawn? Victoria West lui répond. |
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A rectangle in an ellipse |
2007-11-18 |
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David pose la question : I need to find the max area of a rectangle inscribed in an ellipse with the equation
x^2+4y^2=4.. What I have so far is f(x,y)=4xy
g(x,y)=x^2+4y^2-4=0,
y=sqrtx^2-4/4
f'(x)=2x^2/sqrt-4x^2+2(sqrt-4+x^2).
What I need to know is how to finish the problem and find the actual mas area of the rectangle.
David Penny Nom lui répond. |
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ln (x) - x = ln (2) |
2007-11-18 |
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James pose la question : How do you make x the subject of
ln (x) - x = ln (2) Stephen La Rocque lui répond. |
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Red balls and blue balls |
2007-11-18 |
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Md pose la question : In a group of 15, 7 have Red Balls, 8 have Blue Balls and 3 have neither.
What fraction of the group has both Red Balls and Blue Balls? Stephen La Rocque lui répond. |
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Find the radius of a circle given the center and a point on the circle |
2007-11-18 |
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Raymund pose la question : Find the radius if the center is at (0, -5) and one point on the circle is (2,3) Stephen La Rocque lui répond. |
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Two lines |
2007-11-18 |
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Kate pose la question : represent qraphically the equations of these lines and their intersecting points
x-y=2
3x+y=11 Penny Nom lui répond. |
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Red hens and white hens |
2007-11-18 |
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Rapin pose la question : In 15 days, 4 white hens and 3 red hens lay eggs equal to 3 white hens
and 5 red hens lay eggs in 12 days , how many days that white hens can
lay eggs the same amount as red hens lay eggs in 20 days ? Steve La Rocque and Penny Nom lui répond. |
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A thanksgiving day problem |
2007-11-17 |
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svetik pose la question : On Thanksgiving Day, a group of nutty professors dressed up as "turkeys" and participated in a local fundraising event. The event consisted of three types of races: the sprint, the relay, and the hurdles. One more “turkey” takes part in the hurdles only than the sprint only. The same number take part in the sprint and the hurdles as take part in the relay and the hurdles. Eleven of the “turkeys” taking some part in these three races do not do the relay. Five “turkeys” take part in the sprint and the relay and three enter all three races. There are four teams of four “turkeys” in the relay. And, one more “turkey” is running in both the relay and the sprint than in the hurdles only.
“Turkey” Coe turned and said to “Turkey” Kim, “How many ‘turkeys’ were taking some part in any of the three races?” The nuttiest math professor, “Turkey” Young, said “There were ________ ‘turkeys’ taking part in any of the three races.”
Fill in the blank!!! Penny Nom lui répond. |
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A 15% discount |
2007-11-17 |
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Deanna pose la question : if I purchase an item for $450.00 but get a discount 15% of my item what would then be my total syeve La Rocque and Penny Nom lui répond. |
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Expand (a^4 - b^4) |
2007-11-17 |
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Saif pose la question : how would you expand (a^4 - b^4) ??? Stephen La Rocque and Victoria West lui répond. |
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Sides and vertices |
2007-11-17 |
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derek pose la question : What is the correct name for a 2D geometric shape that would look like one slice from a round pizza and how may sides and vertices would it have? I believe you would say it has one vertex and two sides with the curved boundary not resulting in vertices or a side. Your help is much appreciated. Chris Fisher and Walter Whitelty lui répond. |
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The game of 24 |
2007-11-17 |
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Todd pose la question : Hello. My son is very good at the Math 24 game and when he is stumped,
I am usually able to figure it out. However, we are both stumped with
this one. The numbers are 6, 6, 9 and 5. You can use addition, subtraction,
division and multiplication. Please help us equal 24 with those 4 numbers. Claude Tardif lui répond. |
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Exponential form |
2007-11-16 |
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ashley pose la question : write a sentence for exponential form. Penny Nom lui répond. |
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A matrix equation |
2007-11-16 |
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stephanie pose la question : Im supposed to solve
( 1 tan =E8/2) ( 1 tan =E8/2)^(-1)
(-tan =E8/2 1 ) (-tan =E8/2 1 )
Matrix AA<(-1)=I Penny Nom lui répond. |
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lim [x + squareroot(x^2 + 3)] as x->-inf |
2007-11-16 |
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David pose la question : Find the limit. (Hint: treat the expression as a fraction whose denominator is 1, and rationalize the numerator.)
lim [x + squareroot(x^2 + 3)] as x->-inf
i got to
lim -3/(x - squareroot(x^2 + 3)) as x->-inf
but i'm having trouble understanding why the answer is 0 plz explain thx Harley Weston lui répond. |
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