Answer:
a = 32
Explanation:
Step 1: Understand the question
The 2 angles inside are supplamentary angles which means they add up to 180
Step 2: Set up the equation
If the 2 angles added up equal to 180 you can create an equation that states

Step 3: Solve for the variable

Step 4: State your answer
Therefore the value of "a" is 32