Answer:
The measure of ZA is of 148º.
Explanation:
If two angles are supplementary, the sum of their measures is 180º.
In this question:
ZA and ZB are supplementary. So
mZA + mZB = 180
We have that:
mZA = 7x+15
mZB = x + 13
Applying to the formula:
mZA + mZB = 180
7x + 15 + x + 13 = 180
8x + 28 = 180
8x = 180 - 28
8x = 152
x = 152/8
x = 19
Measure of ZA:
mZA = 7x + 15 = 7*19 + 15 = 148
The measure of ZA is of 148º.