$4-9$ John Smith has developed the following forecasting model: Y$^=36+4\mathrm{.}3$X$1$ Where Y$^=$ Demand for K$10$ air conditioners X $1=$ the outside temperature $(\backslash$deg F$)($a$)$ Forecast the demand for K$10$ when the tempera$-$ ture is $70\backslash$deg F$.($b$)$ What is the demand for a temperature of $80\backslash$deg F$?($c$)$ What is the demand for a temperature of $90\backslash$deg F$?$