How can 65% be broken down with friendly percents to find 65% of a number

What is 20+(5 x 2/5 )+ 3 show your work

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

Ineed me i stuck and i don’t want to get it wrong