Respuesta :
Answer:
 1961
Step-by-step explanation:
Put the given information into the equation and solve for the unknown.
 220,000 = 55,000√(x -1945)
 4 = √(x -1945) . . . . divide by 55,000
 16 = x -1945 . . . . . . square both sides
 1961 = x . . . . . . . . .  add 1945
The population was 220,000 in the year 1961.