Cuanto es 968 dividido por 72

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

Acoffee shop orders at most $3,500 worth of coffee and tea. the shop needs to make a profit of at least $1,900 on the order. the possible combinations of coffee and tea for this order are given by this system of inequalities, where c = pounds of coffee and t = pounds of tea: 6c + 13t ≤ 3,500 3.50c + 4t ≥ 1,900 which graph's shaded region represents the possible combinations of coffee and tea for this order?

Find an bif a = {3, 6, 9, 12) and b = {2, 4, 6, 8, 10).