Answer
May: $11.575$
November: $4.63$
Work Step by Step
We have the function determined in part $a)$:
$f(x)=\begin{cases}
0.505x^2-1.47x+6.3,1\leq x\leq 6\\
-1.97x+26.3,6\lt x\leq 12
\end{cases}$
Determine $f(5)$:
$f(5)=0.505(5^2)-1.47(5)+6.3=11.575$
$f(5)=11.575$ represents the revenue for May computed with the model function.
Determine $f(11)$:
$f(11)=-1.97(11)+26.3=4.63$
$f(11)=4.63$ represents the revenue for May computed with the model function for November.
