What property ensures that the answers will be the same with either factor as the multiplicand

The price of a car has been reduced from $19,000 to $11,590. what is the percentage decrease of the price of the car?

You just purchased two coins at a price of $670 each. because one of the coins is more collectible, you believe that its value will increase at a rate of 7.1 percent per year, while you believe the second coin will only increase at 6.5 percent per year. if you are correct, how much more will the first coin be worth in 15 years?

Simplify the expression below -3(10x+4y)+6(6x-2y)