Ms. Cosper and her son live in Plainview, Texas. She has estimated her total monthly expenses as about $2,850. Her payroll and income taxes are $287. What is her necessary monthly salary to have a gross income to meet her total expenses including the payroll and income taxes?

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This law is sometimes called the grouping property. as you can see, regardless of how the numbers are grouped, the answer is still 13. the associative law of multiplication is similar to the same law for addition. it says that no matter how you group numbers you are multiplying together, you will get the same answer.