A. Average weight of the sport utility vehicle (SUV) can be estimated by W=5t2-60t+4700 where is t is time in years (t=0 represents 1970) and W is average weight of the SUV in pounds. According to model in what year were SUVs lightest?
B. How long will it take the $1000 investment to be worth $1500 if it is compound monthly at the annual rate 6%.