5) The population of a culture is quadrupling (4 times greater) every 20min, in a glass of fermented orange juice that someone accidently left on the counter. a) Write an exponential function to represent the growth of the culture C(t) where; represents minutes. (1 mark) b) Write an exponential function to represent the growth of the culture C(t) where; represents hours. (1 mark) c) If the current population of the culture is 120,400, how many cells existed in the culture 75 minutes ago? ("Ago" refers to the past, so how can we represent what happened in the past before 0 min...)