1. With how many bacteria should you inoculate a broth if you wish to obtain 32 768 bacteria after 42 hours? Assume that the bacteria double every 3 hours.

2. A bacterial species in a given growth medium has a gneration time of 2 hours. The cell density of the culture after 24 hours of growth is 2.5x10^8 cells/mL. According to this info, what total length of time is required for the cell density to reach 4x10^9 cells/mL?