Helen has a set of number cards numbered 1 thru 10. If Helen randomly draws 2 cards from the deck, what is the probability that she will draw an even number and then a 5?

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).