Answer:
151
Step-by-step explanation:
So you have to start by finding the total number of degrees inside the shape. The shape has 5 sides.
So using this formula:
(n-2) * 180
(5-2) * 180
= 540 degrees inside the shape
Then solve for x.
5x +2 + 10x - 3 + 8x -19 + 13x - 31 + 7x -11 = 540
43x -62 = 540
43x = 602
x = 14
Plug in for S.
13 (14) -31
151
