If the temperature at 9: 00 pm was 12 degrees farenheit, and after 6 hours the temperature dropped to 6 degrees fahrenheit below 0,what was the rate of change in temperature per hour?

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.