A chemical reaction begins when a certain mixture of chemicals reaches 95°C. The reaction activity is measured in units (U) per 100 microliters (100 μL) of the mixture. Measurements during the first 18 minutes after the mixture reaches 95°C are listed in the following table. Chemical Reaction Time, t (minutes) 0 2 4 r(t) = 6 8 10 12 14 16 18 Activity, r (U/100μL) 0.10 0.10 0.25 0.60 1.00 1.40 1.55 1.75 1.90 1.95 (a) Find the logistic model that gives the activity of the chemical reaction. (Be sure to use t as the independent variable. Round all numerical values to three decimal places.) 1.937 (1+29.0638e(-0.4211)) x U/100μL gives a measurement of the reaction activity of a chemical mixture -?- minutes after the mixture reaches a temperature of What is the limiting value for this logistic function? U/100μL (b) Use the model to estimate the average rate of change of the reaction activity between 9 minutes and 13 minutes. (Round your answer to three decimal places.) U/100μL per minute (c) Numerically estimate to the nearest thousandth by how much the reaction activity is increasing at 11 minutes. (Round your answer to three decimal places.) U/100μL per minute (d) Write sentences of interpretation for the answers to parts (b) and (c). (Round your answers to three decimal places.) Between 9 and 13 minutes after the mixture reached a temperature of 95°C, the reaction activity ---Select-- by an average of C. from Osts 18. U/100μL per minute. After 11 minutes, the reaction activity was ---Select---by U/100μL per minu