exam Maths Puzzle Numerical Ability

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?

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exam Other Question

Amber has 1/2 as much money as Jackie. Amber has $6.00 less than Alexandra. Together they have $54.00. How much money does each young lady possess? 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!