Percent of change 0.55 trees to 31 trees

(98 points) i need with 5 questions. answer definitions are welcomed, but not necessary.

1foot = 12 inches; 1 yard = 3 feet

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.