9. The intensity 1 of light received from a light source varies inversely with the square of the distance from the light source. If the intensity of a light source 4 feet from an
object is 8 candelas, find the intensity at a distance of 8 feet.

This size running track is usually called a 400 meter track. however if a person ran as close to the inside as possible on the track they would run less than 400 meters in one lap. how far away from the inside border would someone have to run to make one lap equal exactly 400 meters