Mr. Anderson is driving on the Autobahn in the Porsche GTS that he rented. His distance from Mr. Smith's vehicle behind him is given by the equation: s(t) = t log₄ (t+3) t > 0 where t is in seconds and s(t) is in meters. Is the distance between Mr. Anderson and Mr. Smith increasing or decreasing at t = 20 seconds? How do you know? Show your work to justify your answer.