As a salesperson, you are paid $50 per week plus $2 per sale. this week you want your pay to be at least $100. what is the minimum number of sales you must make to earn at least $100?

2x + 50 > = 100 (thats greater then or equal)
2x > = 100 - 50
2x > = 50
x > = 50/2
x > = 25

minimum number is 25

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.