Answer:
B
Step-by-step explanation:
∠ BEF and ∠ CFE are alternate angles and congruent, thus
3x + 20 = 2x + 50 ( subtract 2x from both sides )
x + 20 = 50 ( subtract 20 from both sides )
x = 30
Thus
∠ CFE = 3x + 20 = 3(30) + 20 = 90 + 20 = 110°
∠ CFE and ∠ AEF are same- side interior angles and are supplementary, thus
∠ AEF = 180° - 110° = 70° → B
