dives from a platform that is 10 above water. His dive takes him 4.1 meters below the surface of the water. How far does ​'s dive take ​?

I am not sure what you mean.

The diver dove a total of 10+4.1 = 14.1 meters down
However the diver probably then returned to the water surface, another 4.1 meters up
so if that is what you mean, 14.1+ 4.1 = 18.2 meters is distance traveled
However if you mean the length of the vector from start to finish at the surface after surfacing it would be a net displacement of 10 meters.

10 - (-4.1) = ___

To find out how far 's dive takes him, we need to add the distance from the platform to the water's surface (10 meters) and the distance from the water's surface to where he dives (4.1 meters). Using the addition operation, we can calculate:

Distance = Distance from platform to water's surface + Distance from water's surface to dive point

Given:
Distance from platform to water's surface = 10 meters
Distance from water's surface to dive point = 4.1 meters

Using addition:
Distance = 10 meters + 4.1 meters

Solving the addition operation:
Distance = 14.1 meters

Therefore, 's dive takes him a total distance of 14.1 meters.