Write the algebraic expression for: twice a number, n, increased by 9. what do i write

Which is the completely factored from of xy^3-x^3y

Acredit card advertises an annual interest rate of 23%. what is the equivalent monthly interest rate?

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