Use the fact that (a+b)^2 = a^2 + 2ab + b^2 to find the value of 81^2. [hint: (80 + 1)^2]

The track team ran a mile and a quarter during their practice how many kilometers did her team runs?

The coordinate grid shows a pentagon. the pentagon is translated 3 units to the right and 5 units up to create a new pentagon. what is the rule for the location of the new pentagon?

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?