Answer:
17.5
Explanation:
115+(4n-5) are a linear pair.
115+(4n-5)= 180
minus 115
4n-5=65
plus 5
4n=70
divide by 4
n= 17.5
n = 17.5
4*17.5 = 70
70 - 5 = 65
115 + 65 = 180
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