Find a and b.If 1 < x < 9, then a < 7x + 8 < b.
A. a = 15, b = 71
B. a = -1, b = 55
C. a = 16, b = 24
D. a = 9, b = 17
Answer: A
Mathematics
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A. 
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B. 
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C. 
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