Can someone answer. there is one problem. there's a picture. you!

Ineed in figuring out this problem.

Does the point (1, sqrt 7) lie on circle shown.

The population of a small rural town in the year 2006 was 2,459. the population can be modeled by the function below, where f(x residents and t is the number of years elapsed since 2006. f(t) = 2,459(0.92)