Answer
12. C = 66.42 °
Cos R = p/q
Cos R = 20/50
Cos R = 0.4
R = 66.42 °
13. b. tan 53 ° = p/s
(Tan = opposite/ adjacent)
14. c. Csc 53 ° = t/p
(Csc = hypotenuse/ opposite)
15. b. 39.93
Sin 53 = p/50
0.7986 = p/50
0.7986 x 50 = p
39.93 = p
Hope it helps