Hey guys I'm having problems on these three word problems. These problems are going to on a test with in two days. So here they are.

17) Find the area under the "curve" y=3 from x=1 to x=3

18) Find the area between the curves y=x^2 and y=3x

19) Solve the simple differential equation when dy/dx=3x^2 , x=2 , when y=3

So these are the word problems.

Thanks for the help.