Chapter 1.3, Problem 63E

In 2012, 34.1% of all glass containers were recycled. A beverage company used 250,000 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) = 250,000(0.401)¹.

The number of people in a school that have caught a cold can be modeled by C(d) = 3(4d) where C(d) is the number of people who have caught a cold after d days. (a) Use the model to estimate the number of people who have caught this cold after 5 days. (Include units in your answer. More information.) After 5 days have passed, X Units are required for this answer. have caught the cold. (b) Use the model to estimate how long it takes for 192 people to catch this cold. (Include units in your answer. More information.) It takes for 192 people to catch the cold.

On a routine inspection of the water system of Cincinnati, Fernanda discovers a pipe leaking at the rate of L(t) = 0.3t+2 liters/hour, t hours after the leak begins. Fernanda doesn't discover the leak until 2 hours after it began. How much water has leaked out to that point? liters (round your answer to the nearest whole number) Suppose the pipe leaks for t hours. The total amount of water leaked can be expressed as W(t) How long will it be until 38 liters of water will have leaked out of the pipe? (round your answer to the nearest hour)