book Maths Puzzle Numerical Ability

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??

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book Other Question
What is graph does quadratic function and the domain and range?

y = 16 - x^2 Find the dimensions of a rectangle A with the greatest area whose perimeter is 30 ft.