2012, 34.1% of all glass containers were recycled. A beverage company used 450,000 lb of glass containers per year. After recycling, the amount of glass, in pounds, still in use after t years is given by N(t)=450,000(0.39 a) Find N(5), and explain its meaning. b) Find N'(5), and explain its meaning. c) When will 7% of the original amount of glass still be in use? a) N(5)= lb (Round to two decimal places as needed.)