7
Explanation:
90 degree angle so 90 - 55 = 35
5x= 35
5*7=35
Answer:
B
The 2 angles sum to make the right angle , that is
5x + 55 = 90 ( subtract 55 from both sides )
5x = 35 ( divide both sides by 5 )
x = 7 → B
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