The graph shows y as a function of x. Suppose a point is added to this graph. Which choice gives a point that preserves the function? (3.5)
B)
(0,9)
(9. -1)
D
(2, -4)

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.