Answer:
a = 32
Step-by-step 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
[tex](2a+7)+109=180[/tex]
Step 3: Solve for the variable
[tex](2a+7)+109=180\\2a+7+109\\2a+116=180\\2a=64\\\frac{2a}{2}=\frac{64}{2}\\a=32[/tex]
Step 4: State your answer
Therefore the value of "a" is 32
