An isosceles triangle has base angles that each measure 42 degrees. Which equation can be used to find z, the measure of the third angle of this isosceles triangle in degrees

z+42+42=180

Step-by-step explanation:

Since it is an isosceles triangle, the two base angles are the same and remember all the angles add to  180. So use this equation:

z+42+42=180

If you need to find z, it is 96.

Check: 96+42+42=180