Which is closest to the measure of the angle shown?

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?

Shannon drove for 540 minutes. if she traveled 65 miles per hour,how many total miles did she travel?

Agatorade cooler has 36 cups of water. if a serving is 3/4 of a cup how many servings are in the cooler?