exam Maths Puzzle Numerical Ability

Hi,
Can you help me with this math problem?

13.) Find the function value.

Let f(x) =5x.Find f(-2)

The answer should be 1 over 25

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exam Other Question

hello, i need help solving this equation and simplying my answer as much as possible, thanks so much!
2x 3 1
------- - ------ + ------
x^2+x-6 x+3 x-2
I need help defining one variable in terms of another.
The Length of a rectangle is 8in more then its width the perimeter is 24in what are the length and the width? I dont even know where to begin.