Ten students participated in a raffle to win a new computer. there are two new computers being given away, and two students will be chosen at random, one at a time, without replacement. how many possible ways are there to choose the two students? 45 20 100 90

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).