PLS HELP please give an explanation if you don’t have one pls still give answer

What expression is equivalent to (2x-1)(x-3)?

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

How do you write something in scientific notation?