Aschool is planning a field trip to a theme park. a ticket to the park costs $21. for a group of 50 or more, there is a 16% discount. the school saved $756 with the discount. how many tickets did the school buy?

Jackie purchased 3 bottles of water and 2 cups of coffee for a family for $7.35. brian 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? i need this done

Nine more than four times a number is the same as one less than twice the number. find the number?

The graph of a hyperbola is shown. what are the coordinates of a vertex of the hyperbola? (0, −4) (−3, 0) (0, 0) (0, 5)