This lesson introduces students to logarithmic functions as functions of the form , where is a constant and is a positive number. In this unit, students focus on logarithms in base 2 and base 10. Building from the work students have done in the previous lessons with logarithms from an exponential point of view, students make sense of logarithmic functions in a familiar context of population growth. They interpret the equations that represent the functions, graph the functions, and consider why the graphs representing logarithmic functions behave a certain way (MP2, MP7).