How do you write an integer to describe 3 miles below sea level

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

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

Eden has a part time job. she is paid ? 7.20 an hour the week she worked 18 and a half hours how much is she paid