Which number is the smallest? 4.4 ⋅ 10^−5, 3.99 ⋅ 10^−6, 2.6 ⋅ 10^2, 1.85 ⋅ 10^3

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?