Sheila arranged a total of 680. chairs for a school assembly. if she placed an equal amount of chairs in 20 rows, how many chairs are in each row.

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.