An electrician charged a fee of $45 plus $60 per hour to come to Ed’s house and make a repair. How many hours did the repair take if the total bill was $120.

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.