Rachel and her cousin Lena live in different cities about 100 miles apart.On the map the two cities measure 5 inches apart . What is the scale factor used for the map?
On her map 1 inch is equal to 20 miles. 5x=100 divide both sides by 5 x=20 5 is for the 5 inches.x is for the unknown.100 is the 100 miles between the cities. So the scale 1:20