What is the measure of _R?

A. 40
B. 640
C. Cannot be determined
D. 32°

Iknow its nothing to do with education, but what type of thing should i wrote here? ? : ) its for mcdonald's btw.

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?

Find the slope of the line that passes through the points (-3, -1) and (0, 3). 3/4 0 4/3