Answer in terms of square

What value of x is in the solution set of –5x – 15 > 10 + 20x?

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

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