The population of foxes in a certain region over a 2-year period is estimated to beP?(t) = 300 + 60 sin(?t/12)in month t, and the population of rabbits in the same region in month t is given byP?(t) = 2000 + 300 cos((?t/12)Find the rate of change of the populations when t = 4. (Express a decrease in population as a negative rate of change. Round your answers to one decimal place.)