Explanation:
Angles ZA and ZB are supplementary because they form a straight line. Therefore, we can write:
mZA + mZB = 180°
Substituting the given values, we get:
(5x - 4)° + (8x - 28)° = 180°
Combining like terms, we get:
13x - 32 = 180
Adding 32 to both sides, we get:
13x = 212
Dividing both sides by 13, we get:
x = 16.3
Therefore, the value of x is 16.3.