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Divisibility by 9 and 11 |
2006-10-04 |
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Prakai pose la question :
can 818991 divisible by 9, or 11?
Penny Nom lui répond. |
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Inequalities |
2006-10-03 |
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Maleeha pose la question :
a)Use algebra to find the set of values of 'x' for which x(x-5)>36.
b)Using your answer to part a, find the set of values 'y' for which y2(y2-5)>36
Penny Nom lui répond. |
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A 5x2 rectangle |
2006-10-03 |
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Stanley pose la question :
Cut a 5x2 rectangle into 4 pieces, and then put them back into as a square.
Claude Tardif and Penny Nom lui répond. |
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1_._ x _._ = _ _.5 _ |
2006-10-03 |
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Harold pose la question :
1_._ x _._ = _ _.5 _
use numbers 2-9 to fill in the blanks.
Claude Tardif lui répond. |
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A number pattern |
2006-10-02 |
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Tim pose la question :
The patterns that went in 2s, 4s and 5s we got, but we are stuck on the pattern that doubles. We can't come up with the rule or equation that solves it.
With the first number being the term number and the second being the term, this is the pattern:
1-1
2-2
3-4
4-8
5-16
6-32
7-64
100-128
What is the rule for this?
Stephen La Rocque and Penny Nom lui répond. |
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A concrete foundation |
2006-10-02 |
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A homeowner pose la question :
I am pouring a concrete foundation 8" X 14" X 23'. How many cubic feet of concrete do I need?
Penny Nom lui répond. |
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A proof by induction |
2006-10-02 |
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Zamira pose la question :
i'm studying induction but i don't get how to proof that 1+2+2^2+2^3+...+2^(n-1) = (2^n) - 1.
Penny Nom lui répond. |
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Two word problems |
2006-10-02 |
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Eve pose la question :
1. A surveyor's map shows a plan for the rectangular rose garden whose area is
a2+25ab-350b2. Find an algebraic expression for the length and width. If a=20 ft and b=10 feet, find the actual dimensions of the garden.
2.A square is enclosed in a circle. The area of the square is (4r2-32r+64)sq cm and the area of the circle is 484r2 sq cm. Write a polynomial in factored form to represent the difference of the two areas.
Stephen La Rocque lui répond. |
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The hypotenuse |
2006-10-02 |
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Ashley pose la question :
How do you find the hypotenuse of a right triangle? I don't understand how to find c.
Stephen La Rocque lui répond. |
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The area of a circle |
2006-10-02 |
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A student pose la question :
Calculate the area of a circle whose radius is 75 meters?
Stephen La Rocque lui répond. |
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The area of my hand |
2006-10-02 |
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Waikiki pose la question :
is there a possible way for me to calculate the area of my hand (palm and fingers involved)? obviously it is curved and i can't find a way on how to solve it...
Chris Fisher and Diane Hanson lui répond. |
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What is 1.7142857143 as a fraction? |
2006-10-01 |
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Lizzy pose la question :
What is 1.7142857143 as a fraction?
Stephen La Rocque and Penny Nom lui répond. |
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The focus of a parabola |
2006-10-01 |
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Lily pose la question :
I have a mathematical assignment which includes applications of parabolas, hyperbolas and ellipses in the real world. I have been searching the internet and now I am ware that most of the applications of parabolas have a connection with what people call "the focus". However, I do not think I clearly understand what "the focus" of a parabola is. Would you please explain it to me?
Penny Nom lui répond. |
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Prove that 2nCn is less than 4n, for all positive integers n? |
2006-10-01 |
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Anna pose la question :
How can I prove that 2nCn is less than 4n, for all positive integers n?
Penny Nom lui répond. |
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30+7(x-1)=3(2x+7) |
2006-09-29 |
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Art pose la question :
30+7(x-1)=3(2x+7)
I know with the distributive law I multiply 7 by x and 7 by -1 and the same thing to the right, only 3 by 2 and 7 than I am lost?
Penny Nom lui répond. |
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