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 change in depth from one minute to the next.

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.