Problem $1.$ Wheat production, W$,$ in Busheln$/$Acre is a function of temperature $T$ in $C$ and annual rainfall, $R$ is centimeters. Seppose that selentlints observe that swerage temperature is increwing ty $0\mathrm{.}15\frac{C}{?}$ year and rainfall in decreasing by $0\mathrm{.}10c\frac{m}{y}$yar. Murther, it is endismated that

$\frac{\text{d}\text{e}\text{l}\text{W}}{\text{d}\text{e}\text{l}\text{T}}=-3$ and $\frac{\text{d}\text{e}\text{l}\text{W}}{\text{d}\text{e}\text{l}\text{K}}=0$

$($a$)$ Explain, in one or two sentences, the meaning$/$nignificance of $\%=-3.$ The nure to linelade units in your anowy. to include mits in your answer.

$($c$)$ Compute the current rate of chaige of what producture, $,$ where $t$ is in yours Ile sure to isolule usits in your answer.

Problem $2.q,$ Cliven $q,$ f