exam Maths Puzzle Numerical Ability

I had problems with this on my GED and i needed to know can you help me with so that i can get the 10 points i need to get my GED?

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This is 5th grade math and I have TOTALLY forgotten how to do this stuff!!! Please try to explain to me how to solve and check this type of a problem, so I can remember how to do this!!!

x/5=20/4
Solve f(x) is less than or equal to 0 if f(x) = 4 - 3x

Solve q(x) is greater than or equal to 0 if g(x) = x^2 - 4

Solve h(x) is less than or equal to 0 if h(x) = 2x^3 - x^2 -3x