In another survey, jane found that 25% of the total number of teenagers surveyed like sandwiches. if 50 teenagers like sandwiches, what is the total number of teenagers that jane surveyed? show your work.

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).