17) 146 min.
18) 5 hrs and 31 min
19) -1/6
360-150-150=60 arc ac=60, the measure of arc is same as central angle and inscribe angle is half of central angle so answer is 30
10 squared + 13 squared = your answer squared.
So do that then take the square root of whatever you get.
5x - 20 = 8x - 65
-20 = 3x - 65
3x = 45
x = 15