Calculate the size of an exterior angle of a regular pentagon

Which equation represents the partial sum of the geometric series?

What is the area of a triangle with vertices at (-3 3) (-3,2) and (1,2)?

Technicians have installed a center pivot, circular irrigator for a farm that covers 25 acres. a.) how long is the irrigation boom (in feet) from the center pivot to its farthest extent? b.) if the irrigation boom makes 4 full revolutions in a day, how many miles does the end of the boom travel in 5 days?