Which expression finds the measure of an angle that is coterminal with a 300° angle? 300° – 860°300° – 840°300° – 740°300° – 720°

Coterminal means you will land on the same spot after each rotation.  You can rotate counterclockwise (which adds 360 degrees for each rotation) and clockwise (which subtracts 360 degrees for each rotation).

Coterminal to 300 is:
300 +/- 360
300 +/- 720
300 +/- 1080
in other words, 300 +/- 360n

D (300 - 720)