Knox save $56 during the summer break. He spent 3/7 of his savings on a pair of baseball cleats. He spent 5/8 of the remaining money on a baseball bat. How much money does Knox have left after buying the cleats and bat?

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).