9. It is known that 49.4% of all aluminum cans distributed are recycled each year. A beverage company uses 250000 lb aluminum cans. After recycling, the amount of aluminum, in pounds, still in use after t years is given by N(t) = 250000(0.494) a. Find N(3) , and explain its meaning. b. Find N (3) , and explain its meaning c. When will 10% of the original amount of aluminum still be in use