Hello I'm in AP calculus and I don't seem to understand these questions. If you could please explain step by step so I know how to solve and interpret these 4 questions I would gladly appreciate it. Thank you for all that you do.

Sketch the region whose area is given by the definite integral. Then use a geometric formula to evaluate the integral. 7. So -x dx 8. So (8 - 2x) dx 9 . _, V 49 - x2 dx The graph of f consists of line segments and a quarter circle, as shown in the figure. Evaluate each definite integral by using geometric formulas. 10. a ) Lyf (x) dx = b ) I f ( x ) dx = c ) Saf ( x )dx =