Distance between Channing and Mackinley is 4 miles and 155 feet.
Now let us first write the relation between miles and feet.
One mile is equal to 5280 feets.
So here we have to convert 4 miles into feet.
Applying unitary method.
Number of feet in 4 miles = 4*5280 = 21120 feet
Now we add 21120 and 155 together to get the answer in feet.
Adding 21120 +155 we get 21,275 .
Answer: Channing lives 21125 feet away from his cousin Mackinley.