Answer:
4 miles
Explanation:
Formula for calculating the area of a trapezoid is expressed as shown;
![Area = (a+b)/(2) * h](https://img.qammunity.org/2021/formulas/mathematics/high-school/ueyplme8pgpokhetf2v8i07nlv8sfaccf5.png)
a and b are the length of the bases of the trapezoid and h is its height
Given a = 1.2miles, b = 2.4miles, Area = 7.2 square miles
Substituting this values into the formula to get the height;
7.2 =
![(1.2+2.4)/(2)*h](https://img.qammunity.org/2021/formulas/mathematics/high-school/2th10soc8mdj9d4wkkktkpng6knotg2543.png)
![14.4 = 3.6h\\Dividing\ both\ sides\ by\ 3.6\\14.4/3.6 = 3.6h/3.6\\h =4 miles](https://img.qammunity.org/2021/formulas/mathematics/high-school/snxo1hly0po9yc29qnxseh7pae6xtzdzq8.png)
The height of the trapezoid is 4miles