Jon and lexi are playing a marble game. according to their rules, 6 points are awarded for each red marble collected and 2 points are awarded for each blue marble collected. which expression represents jon's total score if he has r red marbles and b blue marbles?

a: 6r - 2b
b: 6r + 2b
c: 6r - 4b
d: 8rb

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?