exam Maths Puzzle Numerical Ability

I am having trouble with this problem:

I have to graph f(x)=a^3/x^2+a^2 if a=4

It would be so cool if someone could help me out on this one. Thanks!

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exam Other Question

Rectangular lot:
The length of a rectangular lot is 50 feet more than the width. If the perimeter is 500 feet, then what are the length and width?
i need to graph these three but i dont know how?

there all supposed two be graphed on one graph

(there three things to this problem)
y=2x^2
y=2(x-1)^2
y=2(x+3)^2

(there