I have to figure out what x equals

x = 108

Step-by-step explanation:

added together, these angles equal 360.

x - 1 + x - 71 + 216 = 360

combine like terms

2x - 72 + 216 = 360

2x + 144 = 360

subtract 144 from both sides of the equation

2x + 144 -144 = 360 - 144

2x = 360 - 144

2x = 216

x = 216/2

x = 108

hello from mrbilldoesmath!

answer:

x - 3

discussion:

x^2 - 9 = (x-3) (x+3)   so

(x^2-9)/ (x + 3) = x-3

you,

mrb