A submarine started at 750 meters below sea level. It rose 50 meters per hour over a 4 -hour period. Which expression represents the new position of the submarine in relation to sea level?
Answer
A
open paren negative 750 plus 4 close paren times 50
B
750 plus 4 times negative 50
C
negative 750 plus 4 times 50
D
negative 750 minus 4 times 50
Explanation
The submarine begins at −750 meters because it is 750 meters below sea level. Rising 50 meters per hour for 4 hours adds 4 × 50 meters, so the expression is −750 + 4 × 50. This is choice C.
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