20. Solve this equation for 0 $ $ 7 : V3sing - v3 = 0. A. 2 B. 2n 3 21. Identify the amplitude and period of this function: y = -cos 20. A. 1, * B. 2, C. 1. 2 D. 2 2 22. Use either the Law of Sines or the Law of Cosines. In ARST, m ZR = 78", m ZT = 395, and TS = 19 in. Find RS. A. 6.6 in. B. 10.4 in. C. 12.2 in. D. 29.5 in. 23. Find the minimum value of this function: A. 4 B. 3 C. -3 D. -4