Gimagine that at a particular time, a kitchen counter has on it 20 bacteria and that this type of bacteria doubles in number every 15 minutes. the exponential function a ( t ) = 20 e 0.04621 t is a good model for predicting the number of bacteria, a ( t ) , in the population t minutes from some particular start time. how many bacteria could be predicted to be on the counter 2.5 hours later? (round to 2 decimal places.)

Ascientist is investigating the effects of salinity on fish development. he places fertilized fish eggs in an aquarium that contains low salinity and observes their development. what factor would improve experimental design the most? place the fish eggs in the open ocean because that is the natural habitat include another aquarium that has normal salinity to compare to the low salinity aquarium include an aquarium that replaces salt with sugar to confirm that the effects are specific to salt grow algae with the fish eggs in order to provide adequate nutrients to the developing embryos