Posted by **bobpursley** on Wednesday, May 23, 2007 at 9:56pm.

I will be happy to critique your thinking.

can u use one of them and show me how to solve it and i'll do the rest? like i dont know how to do these and i need to know how.

assume that Q varied directly as x and inversely as y.

1) if x is tripled and y is doubled, what happens to Q?

2) if x is halved and y is doubled, what happens to Q?

3) if x is doubled and y is halved, what happens to Q?

4) in the formula F=m times pi times l squared over p, m and pi remain constant, l is halved, and p is doubled. how does F change?

Take number two.

Q varies directly as x adn inversely as y. That means Q= k x/y where k is some constant.

If x is halved, and y is doubled..

reducing x by one half means q is reduced by one half. But y is doubled, which means x is halved again (q=k x/y)

So Q goes down to 1/4 or 1/2 *1/2 of the original.

Lets do it the math way now.

Let Qo be the value of kx/y

Q' is the new value.

Q' = k (1/2 x)/2y = 1/4 k x/y=1/4 Qo

so that means the last one, Q is didided by 4?

i dont understand how Q changes can u explain

## Answer this Question

## Related Questions

- science - Distinguish between high-energy and low-energy You have to put this in...
- College Algebra - Simplify the expression: (6ax4)^2(2x)^-2 I will be happy to ...
- maths - evaluate; square root of 0.25 x 10 neg.6 I will be happy to critique ...
- physics - Hi, can you help me with this one? A family ice show is held in an ...
- Calc Help - Find the 4th derivative of y=4x^3-(2/x). Reads: 4x to the third ...
- Math - HOW WOULD I SOLVE SOMETHING LIKE THIS, IT IS AN EXAMPLE I MADE UP. ITS ...
- math - Solve. 15x – 2(6x – 0.865) = 2x + 0.365 We will be happy to critique your...
- Science - In an H-R Diagram, the path showing changes in a star's luminosity and...
- eth125 - How does staying on a Indian Reservation limit choices? Surely you have...
- Algebra1!!! - 1.Six pears and three apples cost $3.90. Two pears and five apples...