What is the surface area to this?

Which is the completely factored from of xy^3-x^3y

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?

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?