Round the numbers so that there is only one non-zero digit, and estimate the answer. Then perform the indicated operation to find the exact answer.13.85 + 31.9 + 9.2
A. estimate: 49; exact: 54.95
B. estimate: 49; exact: 44.95
C. estimate: 50; exact: 55.95
D. estimate: 49; exact: 53.95
Answer: A
Mathematics
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A. 
B. 
C. 
D. 
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Mathematics