book Maths Puzzle Numerical Ability

Find the dimensions of a rectangle A with the greatest area whose perimeter is 30 ft.

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book Other Question

i need help with these problems as well please.

5y squared over y-1 plus 5y over y-1 the answer i got was 10y cubed over y-1?? can you please help me figue out how to solve by graphing x=y=-1;3x-y=-7