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How can we find the measure of an exterior angle if we know the measurement of an interior angle

What expression is equivalent to 1/2(2+3x-6)

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?