Which of the following sets is closed under division ? A)natural numbers
B)non-zero integers
C)irrational numbers
D)non-zero rational numbers​

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.