Free points <3 :D have a great day

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.

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)

3x = 729 solve for x plz . it's urgent. will mark