MATH PROOF HELP

flow chart proof

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)

Which graph has a rate of change of zero

If f(x)=3 over x+2 - square root x-3 then f(7)=