What is the domain of this function in the graph below?

What is the interval?

Find an equation of the line perpendicular to the graph.

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.

What is the total area of the figure?