Csc^2(x)-2csc(x)cot(x)+cot^2(x)=tan ^2(x/2)

When only separate discreet points are graphed it is called?

Jackie purchased 3 bottles of water and 2 cups of coffee for the family for $7.35. ryan bought 4 bottles of water and 1 cup of coffee for his family for 7.15. how much does each bottle of water cost? how much does each cup of coffee cost?

What is the range for 31,39,29,34,37,24,36,33,34,28