Help if you can please..

Which formula gives the area of a triangle? a=1/2(b+h)

What are the solutions of the system? solve by graphing. y = -x^2 - 3x + 2 y = -2x + 2

Sketch the region enclosed by the given curves. decide whether to integrate with respect to x or y. draw a typical approximating rectangle and label its height and width. y= 5x, y=7x^2then find the area s of the region.