Write as an addition problem and find the sum.The team gained 21 yards on the first play, lost 6 yards on the second, and then gained another 12 yards on the third. What was their net gain or loss?
A. 21 + -6 + 12 = 27 yards
B. 21 + 6 + 12 = 27 yards
C. 21 + 6 + 12 = 39 yards
D. 21 + -6 + 12 = 39 yards
Answer: A
Mathematics
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