At a school play, children’s tickets cost $3 each and adult tickets cost $7 each. the total amount of money earned from ticket sales equals $210. which is the number of children's tickets sold for the school play?

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.