geologists estimate that earths temperature rises about 10 degrees celsius for every kilometer k below earths surface.
suppose it is 50 degrees celsius on the surface of the earth. What is the formula for the temperature t in degrees celsius at a dept of k km?
at top -- 50° C
1 km down = 50 + 10
2 km down = 50 + 20 = 50 + 2(10)
3 km down = 50 + 3(10)
...
123 km down = 50 + 123k
...
k km down = ........