Krista spent 6 hours on her homework this weekend. She spent 24 hours studying for her social studies test and 1 hours on her math homework. The
rest of her time she spent writing a book report. How much time did Krista spend
on her book report?

Pls help

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).