An art gallery has 18 paintings and 4 photographs displayed in equal rows on a wall with the same number of each type of art in each row. what could be the number of rows

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.