22. Suppose the amount of ozone in the atmosphere is decreasing exponentinly at a continuous rate of 1.02%, How many years will it take before half the ozone has disappeared ? 22 23. The filter in a swimming pool removes 15% of all impurities in the water every hour it operates . a. How much is left after seven hours ? b. what is the half life ? 24. The number of bacteria in a culture is modeled by the function n/ t) = 500'456 where t mentored hours. a. what is the total number ey bau 6. what is the coat foos growth rate ? C. How many bacteria are in the culture after 3 hours! d . what is the doubling time? d