Please help.
Is algebra.

What is the volume of the sphere shown below with a radius of 3?

Select a graph that have an equation with a < 0

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.