Cassie can drive 165 miles in 3 hour's. if she is driving at a constant speed, how many miles per hour is she driving

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.