How much higher is -58 than -93?

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?

How do you use the elimination method for this question? explain, because i really want to understand!

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36