Which term describes how the two sides of this figure are related

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

Find the distance between (7,-6) and (-3,-9)

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?