victor and maria regularly buy and sell a number of items on eBay craigslist and through the free community newspaper from which they earn about 2000 each year what is accumulated future value of the of those annual amounts over 15 years if the annual earning were invested regularly and provided a 3% return each year?

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).