Please help me ASAP! I'm in a test and I don't know what to do!!

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 value of x when x + 7 = 21?

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)