A bacterial colony is growing at an exponential rate. It is known that after 4 hours, its population is at acteria and after 9 hours it is 189 bacteria. a) Determine an equation in y = a(b)* form that models the population, y, as a function of the num "let x = # of ars of hours, .x. 0=25-2 4428 D) At what percent rate is the population growing per hour? 98=acb14 189= a cb19 184=