Answer:
a = 127
Step-by-step explanation:
These angles are supplementary which means they add up to 180:
15 + a + 38 = 180
a + 53 = 180
a = 180 - 53
angle a + 15° + 38° = 180° [ Linear pair]
a + 53° = 180°
[tex]a = 180 - 53 \\ a = 127[/tex]
So, a = 127°
