Solve. If a submarine goes 3k3 + 18k2 + 3k - 72 miles in3k + 9 hours, then what is its speed?
A. k3 + 3k2 - 8k mph
B. k2 + 13.5k - 8 mph
C. k2 - 3k + 8 mph
D. k2 + 3k - 8 mph
Answer: D
Mathematics
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A. 
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A. 
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