Answer:
x = 8
The measure of angle A = 30°
Step-by-step explanation:
angle A and B are supplementary and their sum is 180°
6x - 18 + 14x + 38 = 180° add like terms
20x + 20 = 180
20x = 180 - 20
20x = 160 divide both sides by 20
x = 8 and the measure of angle A
6x - 18 ➡ 6 × 8 - 18 = 30°
