Question

A submersible is a type of underwater vessel. Suppose a submersible starts at a depth of 40 feet below sea level, represented by –40 feet. The table shows the submersible’s change in depth from one minute to the next.

Time and Depth of Submersible
2:15 p.m. 2:16 p.m. 2:17 p.m. 2:18 p.m.
–40 feet 180 feet lower 175 feet lower 185 feet lower
Answer the questions to find the depth of the submersible after 3 minutes.

1. Write and evaluate a subtraction expression to find the depth of the submersible at 2:16 p.m.

2. Write and evaluate a subtraction expression to find the depth of the submersible at 2:17 p.m.

3. Write and evaluate a subtraction expression to find the depth of the submersible at 2:18 p.m.