So, we are going to let "x" be the height inches (in the model) of a 84 foot building.
According to the information that was given we know that the height of a two-story building is 21 feet and in the scale model its height is 3 inches.Knowing this, we can set up the following proportion:
3/21 = x/84
The final step is to solve for "x" in order to calculate its value. We get that this is: 3/21 =x/84
(84) (3/21) = x
So , an 84 foot building will be 12 inches tall in the model.
(when I do the "3/21 it doesn't mean divide it's a fraction"
