Communication (10 marks) 3. The population of a small town is modelled by the function P() =- 20(4*+ 3) 21+ 5 , where P(t) is the population, in thousands, and t is time, in years, since the start of 1990. Is the population currently increasing or decreasing? Justify your answer. (4 marks) 4. The graph shows the position of a motorcycle during a 30-min trip. S4 G H Is the acceleration positive, negative or zero between each pair of points? (1 mark each) a) O to B b) B to C c) D to E d) E to G e) G to H f) H to