the perimeter p of an equilateral triangle varies directly as the length of a side s if the perimeter is 153cm when the side length is 51cm what would be the perimeter if the side length is 81cm

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?

Xy x xy if a and b are positive integers such that a*b=9 and b*a=72 what is the value of a/b

How many quarts of a 50% solution of acid must be added to 20 quarts of a 20% solution of acid in order to get a 40% solution of acid?