exam Maths Puzzle Numerical Ability

Factor completely.

y3 - 12y2 + 36y
This is my answer is it right?
y(y + 12)(y - 3)

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exam Other Question

I am having difficulty with this equation.
Find the inverse of the function,

f(x) = (3 + 2x)/(2-5x) On three consecutive passes, a football team gains 7 yards, loses 15 yards, and gains 15 yards. What number represents the total next yardage???

The total net yardage is ?? yards.

Thanks..