Answer :
Answer:
87 degrees
Step-by-step explanation:
congruent means equal to set each expression equal to each other:
9 + 6n = 9n - 30
39 = 3n
n = 13
substitute 13 into each expression; make sure they are both equal
Answer:
87 degrees
Step-by-step explanation:
congruent means equal to set each expression equal to each other:
9 + 6n = 9n - 30
39 = 3n
n = 13
substitute 13 into each expression; make sure they are both equal