The deepest mine in the world, East Rand mine in South Africa, reaches $3585 \;m$ into earth's crust. Another African mine western Deep is being deepened to $4100\;m$. Suppose the temperature at the top of the mine shaft is $11^{\circ}c$ and that increases at a rate of $0.015^{\circ}c$ at you descend. <br><br> QUESTION : Represent the temperature in a mine shaft with a function.

Question

$\begin{array}{1 1} (a)\; T = 11-0.015 \;d \\ (b)\; T=11+0.015\;d \\ (c)\; T=-11+0.015\;d \\(d)\; T = -11-0.015\;d \end{array}$