Answer:
x=14.02
Step-by-step explanation:
Use b= to solve for the missing side in the triangle. You will get a rounded answer of 8.49. Then you multiply that by 2 and subtract that value from 31. Then that will be your answer.
I am 100% sure it is A. I did the test and it showed it was A.
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10
10-7 do it yourself and don't vheat