What is greater 7/12 or 1/2

Which of the following is not a subset of {1,2,3}?

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.

The radius of a sphere is 3 inches. which represents the volume of the sphere?