The attached figure represents the explanation of the problem.
The distance between the house and the point B = 7 - 5 = 2
The distance between the house and the cell tower = 4
While the angle B is a right angle.
So, The distance between the house and the cell tower represents the hypotenuse
x and the distance between the house and the cell tower will be the legs
So, x = 
The east distance between Town and House = 2 + x = 2 + 3.464 = 5.464 ≈ 5.5 miles
<u>So, The house will be located 5.5 miles east of the town</u>