Answer:
see explanation
Step-by-step explanation:
13
The 2 angles form a straight line and sum to 180° , that is
x + 30 = 180 ( subtract 30 from both sides )
x = 150
14
Similarly
x + 125 = 180 ( subtract125 from both sides )
x = 55
15
The 2 angles form a right angle, then
x + 27 = 90 ( subtract 27 from both sides )
x = 63
16
The 2 angles form a complete revolution of 360° , then
x + 35 = 360 ( subtract 35 from both sides )
x = 325
