The deer population in a national wildlife refuge has been decreasing by 5% each year. The deer population was 750 in 2007.Write an exponential function that models the population P, of the deer in the refuge n years after 2007

Amass weighing 16 pounds stretches a spring 8/3 feet. the mass is initially released from rest from a point 2 feet below the equilibrium position, and the subsequent motion takes place in a medium that offers a damping force that is numerically equal to 1/2 the instantaneous velocity. find the equation of motion if the mass is driven by an external force equal to f(t)=cos(2t).