Answer:
a = 35°
Step-by-step explanation:
The sum of the measure of the given three angles add up to 180°.
To find the m < a:
m < a + 90° + 55° = 180°
m < a + 145° = 180°
Subtract 145° from both sides to isolate m < a:
m < a + 145° - 145° = 180° - 145°
m < a = 35°
