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A stem and leaf plot |
2007-03-14 |
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From Hazel: Hi,
I wanna ask about my son's homework re: reading stem and leaf plots.
It's really hard for me to understand about this..please show me how.
Ex. Number of dogs competing in dog shows
Stem Leaf
1 62024
2 5295
3 166
4 05
1. What was the least number of dogs at a dog show?
2.What was the greatest number of dogs at a dog show?
3. How many dogs shows are reported in the stem and leaf plot?
thanks...Hazel Answered by Penny Nom. |
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Greatest common divisor |
2007-03-14 |
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From Marie: How do I prove this?
Let h be the greatest common divisor of the positive integers a and b.
Show that there exist integers p and q (not necessarily positive) such that
pa + qb = h.
Thanks Answered by Penny Nom. |
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How many marbles are Red and how many marbles are White? |
2007-03-13 |
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From Angie: A jar has 16 marbles in it. Most of the marbles are Red and the rest are
White. Two marbles are taken out of the jar at the same time. It is
equally probable that two marbles are of the same colour as the two
marbles of different colour (that is the probability that they are both red
or both white is the same as they are different). How many marbles are Red and how many marbles are White?
Could anyone help me with the above question?
Best regards,
Angie Answered by Danny Dyer. |
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A regular quadrilateral |
2007-03-13 |
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From Jackie: How can the measure of each angle of a regular quadrilateral be determined? Answered by Haley Ess. |
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Angle of elevation |
2007-03-13 |
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From Joslyn: A ship at sea sights a 12m high lighthouse on a cliff which is 80m above sea level.
If the angle of elevation to the top of the lighthouse is 27 degrees, calculate the distance from the ship to the shore. Answered by Haley Ess. |
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How many different combinations of players can the coach make? |
2007-03-13 |
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From lisa: there are 8 basketball players on a team. only 5 can play on the court at 1 time. how many different combinations of players can the coach make. the book said the ans. was 56 I do not know how that was please show me how to solve it. thanks Answered by Penny Nom. |
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Kicking a field goal |
2007-03-13 |
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From san: A football player attempts a field goal by kicking the football. The ball follows
the path modelled by the equation h= -4.9^2+10t+3, where h is the height of the
ball above the ground in metres, and t is the time since the ball was kicked
in seconds.
*the ball must clear the uprights for the field goal to count. The uprights are approximately
5 m high. How long does the ball stay above 5 m in height? Answered by Penny Nom. |
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Sketch the graph of the hyperbola and its asymptotes |
2007-03-13 |
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From Katrina: Given (y-2) ^2 – x^2/4 =1 do the following:
Sketch the graph of the hyperbola and its asymptotes. Label the vertices on the graph
I attached the graph thanks for your help! Answered by Penny Nom. |
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Using complex numbers |
2007-03-12 |
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From Kara: Do you use complex numbers in your job? Answered by Stephen La Rocque and Penny Nom. |
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exponential decay of Carbon-14 |
2007-03-12 |
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From Christine: How do I set up the exponential decay formula for Carbon 14 with an initial amount of 1500 grams. Answered by Stephen La Rocque. |
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A roadway over a river |
2007-03-12 |
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From Taranjeet: My teacher has given us bridge with only one measurement. From the river to the roadway is 50 metres in length (vertically) The question he wants us to find out is. What is the distance between the vertical supports. He has said that: At a horizontal distance of 'x' metres from the foot of the arch the height of the arch, the height of the arch above the river 'h' metres is given by: h=-1/40(x squared) = 3x I don't understand how to find the distance between the support beams. Thank you Answered by Penny Nom. |
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x^3 - 3kx + 1 = 0 |
2007-03-11 |
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From Sandra: Show that x^3 - 3kx + 1 = 0 does not have two distinct roots when k < 0. Answered by Stephen La Rocque and Penny Nom. |
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(x+2) is a factor of x^3+bx^2-14x+24. Find the value of b? |
2007-03-11 |
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From victoria: hi my names victoria and i have been stuck on this question for ages can you please help me! (x+2) is a factor of x^3+bx^2-14x+24. Find the value of b? Answered by Penny Nom. |
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A trig limit |
2007-03-11 |
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From Lo: tan(2*x)/sin(3*x) Answered by Penny Nom. |
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Permutations |
2007-03-11 |
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From Meghan: Hello, I'm working on the beginning of the combinatorics unit in Math 12 in BC. We just looked at using the nPr or n!/(n-r)! formula.
My questions for homework that I didn't quite understand how to do were:
Solve each equation for n. 1) nP2 = 90 2) 6Pn = 720
I managed to do these in my head, but I'm not sure how to solve these algebraically.
Thanks for all your help! -Meghan Answered by Penny Nom. |
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