Final answer:
The area covered by the DoorDash drivers is approximately 1016 square miles.
Step-by-step explanation:
To find the area covered by the DoorDash drivers, we need to calculate the area of a circle with a radius of 18 miles. The formula to find the area of a circle is A = πr^2, where A is the area and r is the radius.
Substituting the value of the radius into the formula, we get A = π(18^2), which simplifies to A = 324π. To round this to the nearest whole number, we can use the approximation π ≈ 3.14. Therefore, the area covered by the DoorDash drivers is approximately 324(3.14) = 1016 square miles.