The expression - 340 + 13x represents a submarine that began at a depth of 340 feet below sea
level and ascended at a rate of 13 feet per minute. What was the depth of the submarine after 7
minutes?
Select the correct answer below and, if necessary, fill in the answer box to complete your choice.
O A. The submarine was
feet below sea level after 7 minutes.
OB. The submarine will have reached sea level after 7 minutes.