The population of a southern city follows the exponential law. Use this information to answer parts a through b. (a) If N is the population of the city and t is the time in years, express N as a function of t. N(t)-No ekt (Type an expression using t as the variable and in terms of e.) (b) If the population doubled in size over 14 months and the current population is 10,000, what will the population be 4 years from now? The population will be approximately people. (Do not round until the final answer. Then round to the nearest whole number as needed.)