15. rewrite the given functions in
vertex form, f(x) = x2 + 8x - 10
17. rewrite the given functions in
standard form g(x) = (x + 3)2 - 4

i need plz

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.