A submarine was diving at 77.1 feet per minute. Which number represents the position of the submarine in relation to the surface after 8 minutes?
A. -85.1 ft.
B. -616.8 ft.
C. 716.8 ft.
D. 85.1 ft.

First, Multiply 77.1 by 8 to find how many feet the submarine has dived.

77.1 × 8 = 616.8

Since the question is asking the submarines position "in relation to the surface," this number needs to be negated.

616.8 ⇒ -616.8

The submarine is at -616.80 ft in relation to the surface, so option B is correct.

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