Can someone please explain it to me ASAP?!!! I need help for part b. This is method of substitution

Part 2 or 5 Score: 0 of 1 The population of a culture of bacteria has a growth rate given by p'tt) = r bacteria per hour, forte 0. where r > 1 is a real number. The increase in the population over the time interval [0,0 is given by (1+1) t Jp'tsws. (Note that the growth rate decreases in time. reecting the competition for food and space.) Complete steps (a) through (6) below. 0 . 3. Using the population model with r = 2. what is the increase in the population over the time interval 05 t s 4? z The increase in the population over the given interval is approximateiy 168 bacteria. k (Round down to the nearest integer as needed.) L b. Using the population model with r = 3, what is the increase in the population over the time interval 05 t s 6? l 5 The increase in the population over the given interval is approximately D bacteria. . (Round dmun to the nearest integer as needed.) l ' I:...........- -. \"NHL,\" -AJ'L,, ,.-.. m