Question

You can model the population of a certain city between 1945-2000 by the radical function P(x)=55,000 sqrt x-1945. Using this model, in which year was the population of that city 165,000?
A)1948
B)1951
C)1954
D)1957

Answer 1

165,000 = 55,000 square root (x-1955)
 divide both sides by 55000
 3 = sqrt(x-1945) square
 9 = x - 1945
x= 1954
hope this helps 
option C is right