1.) The Teacher Retirement System promises a 2.2% return on investment. If teacher invest $2,400 in their first year of teaching, how much money
will that become 30 years later?
A.) $3,986.56
B.) $4,610.39
C.) $5,892.12
D.) 57,926.56

Iam unsure about what the proof is, therefore as much as wish to i can not.

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.