You can model the population of a certain city between the years of 1970 and 2000 by the radical function p(x)= 55000√(x-1960).
Use the model to decide what year the population of that city was 235,000
`P(x) = 55000sqrt(x-1960)`
P(x) is the population and x is the year.
When `P(x) = 235000`
`235000 = 55000sqrt(x-1960)`
`235000/55000 = sqrt(x-1960)`
`4.273 = sqrt(x-1960)`
`18.256 = (x-1960)`
` x = 1978.256`
So the population will be 235000 in the year of 1978.