Haley bought 3 notebooks that each cost the same amount and 1 backpack that cost $36. the items she bought cost a total of $48 before tax was added. what was the cost of each notebook

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

An equation where variables are used to represent known values—function notation true or false

Your friend uses c=50p to find the total cost, c, for the people, p, entering a local amusement park is the cost of admission proportional to the amount of people entering the amusement park? explain.