I need help finding the answer to this

Calculate the annual effective interest rate of a 12 % nominal annual interest rate compound monthly

5cakes cost 3.50 how much do 7 cakes cost

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).