20. Use logarithms to evaluate (5.72). What is the answer? A. 14.8 B. 28.6 C. 3.20 D. 6.78 21. Solve for the unknown part of the triangle, if it exists. If b = 125, c = 178, and C=113, then what does a = ? A. 150 B. 122 C.61 D. 87 22. Given that A = 31 +4j, and B = 51 -12], find 3A + 2B. A. 19 i - 12 j B. 19 / + 28 j C. 21 - 24 j D. 21 i + 48 j 23. Perform the indicated operation, leave the answers in the rectangular form a + bi. 2+31 2 31 - A. -5-12/ 13 B. 1 -5+12/ C. 13 -5+12/ D. -5 3 24. logx 8 = 4; x= = A. 12 B. 18 C.6 D. 16