Question

How to find z?

Answer 1

Then you use your property of exterior angle of a triangle.

Answer 2

The sum of the two angles in the triangle is equal to z.

Answer 3

\[180-(z-13)+180-(z+10)=?\]

Answer 4

337??

Answer 5

Hmm, let's see?

180-(z-13)+180-(z+10) = z
180-z+13+180-z-10 = z
360 - z + 13 -z -10 = z
363 - z -z = z
363 = 3z
z = 121