just need help on this question, thank you!

Question 20 (3 points) 20(4+ + 3) The population, P, of a small town is modelled by the function P(!) = 2t + 5 , where tis time, in years, since the start of 1990. a) Is the population increasing or decreasing? Justify your answer. b) The town will need its own transit system if the population exceeds 50 000. Will the town's population ever exceed 50 000? Explain