I just need help with these two questions please

Solve the equation. Write the answer in terms of the common logarithm. 4 - 108 -X =15 The solution set is (Type an exact answer in simplified form. Use a comma to separate answers as needed.) The population of a southern city follows the exponential law. Use this information to answer parts a and 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) = Noekt (Type an expression using t as the variable and in terms of e.) (b) If the population doubled in size over 24 months and the current population is 60,000, what will the population be 3 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.)