The population of California was 10.5 million people in 1950 and 23.7 million in 1980. a. Assuming that the population grows exponentially, find the rate of growth, k, and the function that models the population after t years. Round k to five decimal places. 4a k a 4a. (function 1). b. When will the population from 1950 double? Show the steps in your computation and round your answer to the nearest tenth.