Final answer:
The expression representing the diver's descent is 10 + 17 + 9, and the diver's depth after these movements is 36 feet below the surface.
Step-by-step explanation:
The student is asking about the depth a diver has reached after a series of movements underwater. To begin with, the diver is already 10 feet below the surface. The diver then descends an additional 17 feet, and after a pause, continues to descend another 9 feet.
1. The expression that represents the diver's descent is:
- Initial descent: 10 feet below
- Second descent: 10 feet + 17 feet
- Third descent: 10 feet + 17 feet + 9 feet
We can sum these movements up as an algebraic expression: 10 + 17 + 9.
2. To find the diver's total depth, we just add these numbers together:
10 feet (initial) + 17 feet (second descent) + 9 feet (third descent) = 36 feet
So, the diver's depth after these movements would be 36 feet below the water's surface.