150 yards equals how many feet

What is the multiple zero and multiplicity of f(x) = (x ? 3)(x ? 3)(x + 5)? multiple zero is 3; multiplicity is 2 multiple zero is 5; multiplicity is 1 multiple zero is ? 5; multiplicity is 1 multiple zero is ? 3; multiplicity is 2

Find the condition that the zeros of the polynomial f(x) = x^3+3px^2+3px+r may be in a.p.

Can anyone with some algebra 1 homework? : )