Each inch on a map of Roswell, New Mexico represents $0.51\text{ mile}$. If two hills in Roswell are $7$ inches apart on the map, then how many miles apart are they in real life? Enter your answer as a decimal, without units.
1 inch = .51 mile
7 inches = 7 x .51 mile = 7*.51 = 3.57 (miles)