How to do these problems

Rewrite the following without an exponent. (5/8)-1

The classrooms are trying to raise $1,200.00 for charity. mrs. leblanc's class has raised 50%. mr. patel's class has raised $235.14 ms. warner's class has raised 1/3 as much as mrs. leblanc's class. how much more money is needed to reach the goal of $1,200.00?

What is the answer to question 11? will give extra points! include a explanation (reasonable) for you : )