Question

The function f(x) varies inversely with x and f(x) = 0.9 when x = 0.5.

What is f(x) when x = 1.5?

(Points : 5)
0.02
0.03
0.3
0.75

Answer 1

So the only trick here is the f(x) varies inversely!
Do you know what that means?

Answer 2

What happens with f(x) if you triple the value of x?

Answer 3

Well x would equal 1.5 so it woudl increase the value of f(x) ?.... @Andras

Answer 4

No, that is the trick

Answer 5

x and f(x) are inversely related.
This means that if you increase x than f(x) is decreasing.
So if you triple x, what happens to f(x)?

Answer 6

It will decrease! f(x) will decrease

Answer 7

To the third of the original value.
Do you know the answer now?

Answer 8

0.02? @Andras

Answer 9

idk. I don't even now how to solve the orignal one

Answer 10

:(

Answer 11

x=0.5
it is change to
x=1.5

That is exactly triple (0.5*3=1.5)
f(x)=0.9
when x is tripled f(x) becomes third (inversely related)
0.9/3=0.3

Answer 12

OHHHHHHHHHHHH I UNDERSTAND. You have to do the same thing to both. i get it now! Thanks !!!