An aircraft carrier made a trip to a navigational buoy and back. On the trip there it traveled 24 kilometers per hour and on the return trip it went 22 kilometers per hour. If the round trip took
12 hours, how long did it take to travel to the navigational buoy?

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.