SOMEONE HELP IM STUCK PLEASE HURRY

Im literally having a mental breakdown

Susie wants to take her friend out for lunch.she wants to spend $9.75 each person. how much will she spend in all.

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).