Pls, help I'm so lost- how many different ways can a SRC with 4 members be chosen from a group of 5 people?

Aman is 6 feet 3 inches tall. the top of his shadow touches a fire hydrant that is 13 feet 6 inches away. what is the angle of elevation from the base of the fire hydrant to the top of the man's head?

If 5x - 2 = -12, then x = a) -50 b) -4.4 c) -2.8 d) -2

Me i'm timed right now! there's 4 answer