Yahoo Answers: Answers and Comments for Maths Problem Need Urgent Help!!? [Mathematics]
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From Anonymous
enUS
Tue, 10 Mar 2009 12:58:30 +0000
3
Yahoo Answers: Answers and Comments for Maths Problem Need Urgent Help!!? [Mathematics]
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From staci: I can't answer that, because for that frac...
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Fri, 27 May 2016 04:30:45 +0000
I can't answer that, because for that fraction, I don't know if the numerator is 5, (4+5), (2*4+5). Same with the denominator. However, if I assume that you mean: 2 x 4 + (5 / 2)  3 x 4 + 3 = then follow the order of operations, PEMDAS. That stands for Parentheses, Exponents, Multiplication, Division, Addition Subtraction. Multiplication and division are done at the same time but from left to right, as are addition and subtraction. So first, you can't do anything with what is in parentheses, and there are no exponents, so start with multiplication and division: (2*4) + (5/2) (3*4) +3 = 8 + (5/2) 12 +3 Now, add or subtract from left to right: (8 5/2) 9 convert to improper fractions with a denominator of 2: 21/2  18/2=3/2 So the answer is 3/2.

From Anonymous: To find out the proportion solve the equation
...
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Tue, 10 Mar 2009 13:11:07 +0000
To find out the proportion solve the equation
2squared * N = 72
4N = 72
N = 18
so
Y = XSquared * 18
When x  1/2,
(1/2)squared * 18 = y
1/4 * 18 = y
y = 4.5

From robertebalmer: Since y is proportional to x^2, call that prop...
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Tue, 10 Mar 2009 13:06:14 +0000
Since y is proportional to x^2, call that proportion "k". Then:
y = k*x^2
If y = 72 when x = 2, plug those in to find k:
72 = k*2^2
72 = 4*k
18 = k
So the answer to part a) is y = 18*x^2
For b), just plug in 1/2 for x and solve:
y = 18*(1/2)^2
y = 18*(1/4)
y = 18/4 = 9/2 = 4.5

From Andreas A: a)
y = 18x^2
b)
y(1/2) = 18 * 1/4 = 18/4 =...
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Tue, 10 Mar 2009 13:05:50 +0000
a)
y = 18x^2
b)
y(1/2) = 18 * 1/4 = 18/4 = = 9/2 = 4 1/2 = 4.5

From Anonymous: First of all, if y is directly proportional to...
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Tue, 10 Mar 2009 13:05:23 +0000
First of all, if y is directly proportional to the square of x, you can write this as
y = kx^2, where k is a constant of proportionality.
Because you have been given two values, it is possible to work out the value of k.
(i've used * for multiplication to avoid confusion with x!)
72 = k * 2^2
72/4 = k
k = 18
So your answer to a is y = 18x^2
For b simply plug in 1/2 to your equation:
y = 18 * (1/2 ^2)
y = 18 * 1/4
y = 4.5

From mom: y is directly proportional to the square of x....
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Tue, 10 Mar 2009 13:04:18 +0000
y is directly proportional to the square of x.
y=72 when x=2
y=kx²
72=k(4)
18=k

a) Express y in terms of x
y=18x²

b) Work out the value of y when x=1/2.
y=18(1/4)
y=4.5

From Anonymous: Do your own questions!
ask sombody in person ...
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Tue, 10 Mar 2009 13:03:50 +0000
Do your own questions!
ask sombody in person or tell the teacher you dont understand