Find the Rule of the quadratice function y=a(x-h)^2+k with given vertex (-2,-7) and given point (1,3)​

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.