Find the measure of angle C

Giving 100 points asap bev has to cut her grandma's grass this weekend and wants to know exactly how much area she will be cutting. calculate the area of the polygon. be sure to show all your work and explain your answer.

What are the soultion(s) to the quadratic equation 40- x^2=0

In the figure shown below, m < 40 and ab =8. which equation could be used to find x?