3. The number of cellular phones in use in the United States is increasing exponentially. The number, N, in millions, in use is given by the exponential function N(t) = 0.05(1.32)', where "t" is the number of years after 1990. (Source: Cellular Telecommunications and Internet Association) %3D Find N(30) and explain its meaning in the context of the scenario. a. b. Find t when N(t) = 420 and explain its meaning in the context of the scenario.