Which of the following are identities? Check all that apply. A. sin^2x = 1 - cos^2x
B. sin^2x - cos^2x = 1
C. tan^2x= 1 + sec^2x
D. cot^2x= csc^2-1

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?