The area of a rectangular fountain is x^2 +21x+20 square feet. a 5-foot walkway is built around the fountain. find the dimensions of the outside border of the walkway.

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?

The legs of a right triangle measure 6 meters and 8 meters. what is the length of the hypotonuse.

For the sequence [tex]a_{n} = 2n/(n+1)[/tex], what is the value of [tex]a_{10}[/tex]