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A bronze statue is made in two sizes. |
2007-12-17 |
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From Sara: Hello!
A bronze statue is made in two sizes.
The taller statue is 15 cm high and the shorter one is 9 cm high.
The taller statue weighs 3.75 kg. What is the weight of the shorter statue? Answered by Penny Nom. |
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Circle area |
2007-12-17 |
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From Marlena: Ok, i do not see how to get the area of circles! they give you the circumfrance
which is 43.96cm and then u have to find the radius and area. I got the area right
which was 7cm but then i got 21.98 for a area and the real answer was 150.39cm
What did i do wrong? Answered by Penny Nom. |
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A 300 ton train locomotive is built at exact half scale in all dimensions |
2007-12-16 |
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From Normand: When a 300 ton train locomotive is built at exact half scale in all dimensions
we assumed the weight would be 150 tons.
Like a bar of solid steel cut in half would be.
Why does this not work out?
What are we missing here? Answered by Penny Nom. |
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What length scale factor should he use? |
2007-12-16 |
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From Lisa: Hi! Joe wants to enlarge a picture so that its area is doubled.
What length scale factor should he use? Answered by Penny Nom. |
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lim sinx/(x +tanx) |
2007-12-16 |
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From shimelis: i have problem how do you solve this equation
lim sinx/(x +tanx) Answered by Harley Weston. |
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The Principle of Mathematical Induction |
2007-12-15 |
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From iris: we have some confusion in our problem. Please help us.
We would like to know "the principle of mathematical induction"
(i) for n=1, p(1) is true.
(ii) assume that for n=k>=1, p(k) is true we have to prove p(k+1) is true. Here (Is n=k>=1 true? or Is n=k.1 true?)
Thanks. Answered by Penny Nom and Victoria West. |
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The perimeter of circle |
2007-12-15 |
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From shaquilla: what is the perimeter of a circle. Answered by Penny Nom. |
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Negative numbers |
2007-12-14 |
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From mannal: what negative integers do we use in the real world? like -30 temperature? Answered by Penny Nom. |
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A triangle and a rectangle |
2007-12-14 |
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From Someone: A certain triangle has sides that are, respectively, 6inches,
8inches, and 10 inches. A rectangle with a n area equal to that of the triangle
has a width of 3 inches. What is the perimeter of the rectangle, in inches. Answered by Penny Nom. |
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Inflation rate |
2007-12-14 |
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From cassie: In 1972, Bob could fill his car with gasoline at a cost of $3.00.
In 2007 it cost him $45.00 to fill his car. From 1972 to 2007, what
is the annual inflation rate for gasoline?
How does this inflation rate change when you change the cost to
$0.25 per gallon in 1972 to $3.20 per gallon in 2007? Answered by Stephen La Rocque. |
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Finding all the angles |
2007-12-13 |
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From Rajesh: An eqilateral triangle is drawn in a square with one of the side as its base and draw the lines from the other angular sides such that there are four triangles
formed inside the square which includes the equilateral triangle.I want to know all the angles of all the triangles formed inside the square. Answered by Stephen La Rocque and Penny Nom. |
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A palindrome |
2007-12-13 |
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From pradip: I have discovered that for any n-digit number, when it's terminal digits are reversed,e.g.,1729 & 9721 & the resulting combinations are subtracted, the resulting solution is always a multiple of 9 & when this multiple of 9 is divided by 9, we will always get a palindrome, Example- 1234 & 4231, 4231-1234=2997/9=333., please I am not sure about the above fact, would please help me in confirming my discovery. Answered by Harley Weston. |
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A 3 digit number |
2007-12-13 |
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From Kim: Find the number from the following clues:
A) is is a 3 digit even whole # divisible by 5
B} Each digit is different
C) Its hundreds digit is greater than its tens digit
D) It is less that 400, divisible by 3, and has only 1 odd digit. Answered by Penny Nom. |
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Is math anxiety a learning disability? |
2007-12-13 |
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From Steven: Is math anxiety a learning disability? Answered by Victoria West. |
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A 45-45-90 triangle |
2007-12-13 |
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From Aaditya: explain to me please how to do the 45-45-90 theorem when one of the legs(not the
hypotenuse) is 3. How do you find the remaining two sides? please help me out. Answered by Leeanne Boehm. |
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