Final answer:
The change in elevation for a pipe running from an elevation of 45m to an elevation of 115m is an increase of 70 meters.
Step-by-step explanation:
To find the change in elevation for a pipe running from an elevation of 45m to an elevation of 115m, you subtract the lower elevation from the higher elevation. This calculation is similar to finding the rise in the example given, which involves subtracting one altitude from another to derive a change.
Change in elevation = Higher elevation - Lower elevation
Change in elevation = 115m - 45m
Change in elevation = 70m
This means that the pipe has an elevation increase of 70 meters from the starting point to the endpoint.