Users can obtain a cell signal within an area of 2,119.5 square miles.
Explanation:
Given that a cell tower is capable of providing a signal to cell phone users within a 30 mile radius, and 1/4 of this area has devices to block the signal, to determine within what area can cell users obtain a cell signal the following calculation must be performed:
Area of a circle: Pi x (radius x radius)
Area: 3.14 x (30 x 30)
Area: 3.14 x 900
Area: 2,826 square miles
1 - 1/4 = 3/4
2,826 x 3/4 = X
8.478 / 4 = X
2,119.5 = X
Thus, users can obtain a cell signal within an area of 2,119.5 square miles.
