Can someone help me with number 13

Someone which statements are true? check all that apply.

In the figure below, m∠r is 60°, and m∠t is 120°. what is m∠q? a. 60° b. 30° c. 120° d. 54

Benefit(s) from large economies of scale, in which the costs of goods decrease as output increases. natural monopolles perfect competition