When can we not use the distributive property?

Which table shows a proportional relationship between miles traveled and gas used?

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers

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?