How do I do number 16?

Answer: x = 121 degrees
Step-by-step explanation:
(n-2) x 180
(6-2) x 180
4 x 180=720
599 +x = 720
599 - 599 = x +x = 720 - 599 = 121
and then add up all the degrees
88 + 105 + 142 + 140 + 124 + 121 = 720
so there for you answer for x is 121 degrees