Section $6$:

A company manufactures and sells Halloween candy each year. Output $x$ is measured in tons of candy. The revenue and cost functions are:

$R(x)=14x-x^2,C(x)=16+4x.$

$($a$)$ Graph revenue on the axes below. Be sure to label the axes and give tick marks with units. Mark also the x$-$intercepts and the vertex.

$($b$)$ On the same set of axes, graph the cost function. Place a dot on each breakeven point and label the y$-$intercept and one other point.