If the triangle's sides are given by
2x-3
x-12
7x+1
Then all you have to do is to add them up, simplify your result and compare your result to each of:
a. -10x + 14
b. 9x- 14
c. 10x +14
d. 10x - 14
Adding together the following, we get:
2x-3
x-12
7x+1
---------
10x -14
