Question

A scientist was in a submarine below sea level, studying ocean life. Over the next ten minutes, she descended 21.4 feet. How many feet had she been below sea level, if she was 90.6 feet below sea level after she descended?

Answer 1

Step 1:

Let the height below sea level before she descends = h feet

The length she descended after 10 minutes = 21.4 feet

The height of the submarine after descended below the sea level = 90.6 feet

Step 2:

Height of the submarine before descended below the sea level

x = 90.6 - 21.4

x = 69.2 feet

Final answer

69.2 feet