Question

Evaluate the expression. Use estimation to check your answer. Susmarine DEPTH A submarine is at a depth of 725 feet below sea level. Five minutes later, it is at a depth of 450 feet below sea level. What is the change in depth of the submarine? Did it go up or down?

Short answer

The change in depth is 275 feet (since 725 - 450 = 275). Since this is a positive number, it indicates the submarine ascended during this timeframe.

Step-by-step solution

Calculating the Change in Depth

We know that the initial depth of the submarine is 725 feet and the final depth is 450 feet. In order to find the change, we can subtract the final depth from the initial depth such that: Change in Depth = Initial Depth - Final Depth = 725 - 450

Interpreting the Result

If the result is a positive number, it indicates that the submarine ascended, if it's a negative number it indicates the submarine descended.