how many feet are there in 4,000 miles?

What part of my previous answer don't you understand?

http://www.jiskha.com/display.cgi?id=1334607654

21120000 feet.

To determine how many feet are in 4,000 miles, we need to know the conversion factor between miles and feet.

There are 5,280 feet in a mile. So, to convert miles to feet, we can multiply the number of miles by 5,280.

Mathematically, the calculation would be as follows:

4,000 miles * 5,280 feet/mile = 21,120,000 feet

Therefore, there are 21,120,000 feet in 4,000 miles.