write an expression for how much the temperature increases x kilometers below the surface

Question

1. The temperature beneath Earth's surface increases by 10 degrees celcius per kilometer.  The surface temperature and temperature at the bottom of a mine are shown.  How many kilometers below Earth's surface is the bottom of the mine?  Surface is 18 degrees celcius.  Bottom of the mine is 38 degrees celcius.
2. Write an expression for how much the temperature increases x kilometers below the surface.
3.  Write an equation that relates the changein temperature, from 18 degrees celcius at Earth's surface to 38 degrees celcius at the bottom of the mine, to the expression for how much the temperature increases x kilometers below the surface.

Answer 1

top=18deg S, bottom=38 deg, so delta=20

10deg per km, so bottom=2 km

temper=10*deep