True painful question. If you get it right, automatic brainliest. 5 stars and thanks for ALL, even for comments. I am sorry for spamming Khan Academy questions...
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Answer:
31.4/3.14=10
10/2=5
5 x 5 = 25
25 x 3.14 = 78.5
78.5 is the correct answer
Step-by-step explanation: