Could someone me in american government

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 is the missing constant term in the perfect square that starts with x^2 -20x

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much