Answer:
D. 145°
Step-by-step explanation:
Since Angles ∠CBA and ∠DBE are vertically opposite
Then
m∠CBA = m∠DBE
Then
2x + 21 = 5x
Then
3x = 21
Then
x = 7
Therefore
m∠DBE = 5x = 5 × 7 = 35
…………………………………………………
Since Angles ∠DBE and ∠ABE are supplementary
Then
m∠ABE = 180 - m∠DBE
= 180 - 35
= 145°
