PLS HELP MOST CONFUSING TOPIC

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

Determine whether the points (–3,–6) and (2,–8) are in the solution set of the system of inequalities below. x ? –3 y < 5? 3x + 2 a. the point (–3,–6) is not in the solution set, and the point (2,–8) is in the solution set. b. neither of the points is in the solution set. c. the point (–3,–6) is in the solution set, and the point (2,–8) is not in the solution set. d. both points are in the solution set.

Someone me what is the area of this figure? 18m 18m 8m 16m