A bank loaned out $54,000 part of it at the rate of 2.75% per year and the rest at a rate of 3.25% per year. If the interest received was %1595.00 how much was invested at 3.25%. Plz help!

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?