Question

The expression - 380 + 11y represents a submarine that began at a depth of 380 feet below sea level and ascended at a rate of 11 feet per minute. What was the depth of the submarine after 8 minutes?

Answer 1

The submarine was at a depth of 292 feet below sea level after 8 minutes, calculated by substituting 8 into the expression -380 + 11y.

Step-by-step explanation:

The expression -380 + 11y represents a submarine's depth, where -380 is the starting depth in feet below sea level and 11y is the ascending depth in feet after y minutes.

To find the depth of the submarine after 8 minutes, plug in 8 for y and calculate:

-380 + 11 × 8 = -380 + 88 = -292.

Therefore, the submarine was at a depth of 292 feet below sea level after 8 minutes.