Answer:
d. -34
Step-by-step explanation:
Angles F and C are supplementary, so ...
(2x +146)° + (4x +238)° = 180°
6x = -204 . . . . . divide by °, collect terms, subtract 384
x = -34 . . . . . . . . divide by 6
_____
Check
∠F = 2x+146 = 2(-34)+146 = 78 . . . . degrees
∠C = 4x+238 = 4(-34)+238 = 102 . . degrees
These angles are both positive and supplementary. The answer checks OK.
