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Which rational number could be graphed between -4 and -5

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

Define multiplicative inverse. give an example of a number and its multiplicative inverse.