Why should the ages of the Appalachian and Rocky mountains affect their height?

What is x and y intercepts for y=x+7

Melanie is buying a bathing suit that costs 39.99. she is given a discount at the cash register of $6.00 when she scratched 15% off on a game piece for a store promotion. what will the sale price of melanie’s bathing suit be?

Simplify using positive exponents only.