20+20=40 because if u add ten again then it would be 10+10 and that. Would be 20 then 20+10 is 30 then 30+10 then that would be 40 so then 20+20= cause 2+2=4 then add the zero to get 40

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.