Solve.The highest point at an oil drilling operation is the top of the 71-foot-high oil drilling rig. The lowest point the drill head has reached so far is -213 feet. How far above the drill head is the top of the oil drilling rig?
A. 284 ft
B. -213 ft
C. 142 ft
D. -284 ft
Answer: A
Mathematics
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, 
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, 
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, 
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, 
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- 
= 1
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D. 
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A. 
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C. 
D. 
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