Im almost sure that's the answer but keeps saying incorrect. Can anyone help pls

Biologists stocked a lake with 500 fish and estimated the carrying capacity (the maximal population for the fish of that species in that lake) to be 4400. The number of fish doubled in the first year. (a) Assuming that the size of the fish population satisfies the logistic equation amps), dt K determine the constant k, and then solve the equation to find an expression for the size of the population after 75 years. Is: : 0.8303 , P 2200000 15 = _ . . ( ) 500+3900e 08303" (b) How long will it take for the population to increase to 2200 (half of the carrying capacity)? It willtake 2.4739 years. Note: You can earn partial credit on this