3x+(-30) divided by 5

Find the value of the cosine for angle a

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

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base