Answer:
b)
Explanation:
Supplementary angles add up to 180 degrees, so the answer must be b). Let's check the math:
77 + (5x + 18) = 180
-77 -77
(5x + 18) = 103 --> here we already know this is correct, as the problem tells us that angle H is equal to this equation, (5x + 18), and we know that it is also equal to 103.