Write an numerical expression for "6 times the sum of 4 and 5."

The sum of two numbers is 12 and their difference is 18 what are the two numbers

Need on this geometry question. explain how you did it.

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?