Answer: [tex]actual\ lenght=720\ feet[/tex]
Step-by-step explanation:
You need to analize the information provided in the exercise.
First, you know that the scale of the diagram of the plane is:
[tex]0.5\ inches= 80\ feet[/tex]
Then, knowing that the lenght of the diagram is 4.5 inches, you need multiply this lenght by 80 feet and divide the product by 0.5 inches, in order to find the actual length of the plane.
Therefore, you get:
[tex]actual\ lenght=\frac{(4.5\ inches)(80\ feet)}{(0.5\ inches)}\\\\actual\ lenght=720\ feet[/tex]