F(x)= squad root of x plus 3. find the inverse

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section

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)

Hurry if the population of of an ant hill doubles every 10 days and there are currently 100 ants living in the ant hill what will the ant population be in 20 days