Evaluate 2-(-4)+3+(-6)-(-2)

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

What is the number 321,000,000 in scientific notation? also what is the number? ?

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