Answer:
16
Step-by-step explanation:
don't let the x confuse you. remember add up all the corners of the triangle to get 180.
(9x-8) + (x+10) + (x+2) = 180
add all numbers by themselves and add the variables together
9x + x + x = 11x
-8+10+2=4
11x + 4 = 180
11x = 176
x= 16
