ana maria are 43 de timbre in trei clasoare. din primul pune 4 in al doiilea si 4 in al 3 lea. in primul clasor vor ramna de doua ori mai putine timbre si cu 3 mai putine decat in al 3 lea clasor. cate timbre sunt in fiecare clasor? repde va rog, mai am o ora la dispozitie :

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.