Find the distance between the two points rounding to the nearest tenth (if necessary). (4,2) and (1, -2)

In 1950, scientists estimated a certain animal population in a particular geographical area to be 6,400. in 2000, the population had risen to 7,200. if the animal population experiences the same percent increase over the next 50 years, what will the approximate population be? a) 8,000 b) 8,100 c) 8.400 d) 8.600