Answer:
B, C and D
Step-by-step explanation:
5x - 10 = 4x + 7 ( vertical angles )
Subtract 4x from both sides )
x - 10 = 7 ( add 10 to both sides )
x = 17
Thus
4x + 7 = 4(17) + 7 = 68 + 7 = 75° ⇒ D
and
4x - 14 = 4(17) - 14 = 68 - 14 = 54° ⇒ C
The sum of the 3 angles in the triangle = 180°
subtract the sum of the 2 angles from 180 for third angle
third angle = 180° - (75 + 54)° = 180° - 129° = 51° ⇒ B
