16.The temperature T {in degrees Fahrenheit) of a person during an illness is given by m) = 4.11:2 +1.2: + 93.5. where r is the time in days. c. Find 7(a) and interpret your results. d. Find T'{8) and interpret your results. 11A company that produces snowboards. which are seasonal products. forecasts monthly sales for one year to be S = 74.50 + 43.75cos{%5) where S is sales in thousands of units and t is the time in months. with t =1 corresponding to January. How fast are sales changing in September? 13.When the air temperature is a constant 15 degrees Fahrenheit. one formula that meteorologists can use to calculate wind chill temperature is WCts) = 55.174- 2.153- 23.1B-J3. where s is the wind speed in miles per hour and WC is the wind chill in degrees Fahrenheit. Find the rate of change of wind chill when the wind speed is 25 miles per hour