Question

The expression −320+17.1m represents a submarine that began at a depth of 320 feet below sea level and ascended at a rate of 17.1 feet per minute. What was the depth of the submarine after 9 ​minutes?

Answer 1

The depth of the submarine after 9 minutes is -166.1 feet below sea level.

Step-by-step explanation:

The expression −320+17.1m represents the depth of a submarine in feet after it ascends from an initial depth of 320 feet below sea level at a rate of 17.1 feet per minute.

To calculate the depth of the submarine after 9 minutes, we can use the formula: depth = initial depth + rate * time. In this case, the initial depth is -320 feet (below sea level) and the rate is 17.1 feet per minute. Plugging in these values into the formula, we get:

depth = -320 + 17.1 * 9 feet

Simplifying the expression, we find:

depth = -320 + 153.9 feet

Combining the terms, we get:

depth = -166.1 feet

Therefore, the depth of the submarine after 9 minutes is -166.1 feet below sea level.