20. x = 360-72 = 288
y = 1/2 (288-72) = 108
21. x = 1/2 (250-110) = 70
22. x = 1/2(85 + 140) = 112.5
y = 180 - 112.5 67.5
23. 7*8 - 10*x
x = 5.6
24. x^2 = 6*18
x = sqrt(108) = 10.39
25. 6 (x+6) = 5 * (21)
6x + 36 = 105
6x = 69
x = 11.5
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