What is the average rate of change of f(x)= 1/2 x2 - 4 over the interval from 0 to 3?

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?

If f(x) = 3x-2 and g(x) =2x+1 find (f-g)(x)

Factor this polynomial completely. x^2-8x+12