The resale value of a used vehicle is given by the formula V = C(0.8)" where V is the resale value is dollars, C is the original
price, and n is the age of the vehicle. The vehicle was originally
$36,000, how old will the vehicle be when it's resale value is
$8440.87.

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.

1/b^3m^3               i don't know why you couldn't do it yourself its not that hard