To predict the outcome of the vote for the school board election, a candidate uses random number to pick 100 registered voters. She calls these voters and asks how they plan to vote. Cure s the sample taken in this problem representative of the population? Explain.

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).