Answer:
x = 30°
<A = 132°
Step-by-step explanation:
<A = <B
5x - 18° = 3x + 42°,. solve for x
add 18° to both sides
5x = 3x + 60°
subtract 3x from both sides
2x = 60°
divide both sides by 2
x = 30°
substitute 30° for x in the equation for <A
5(30°) - 18° = 132°
