13 to the second power re-write in expanded form

What is the average rate of change for this function for the interval from x=2 to x=4 ?

Write an equation for the function that includes the points (1,4/5) and (2,2/3)

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.