A small object with in initial temperature of 135° Fahrenheit is dropped into a tub with a
temperature of 60° Fahrenheit. The function f(t) = Ce-kt + 60 represents the situation,
where t is time in minutes, C is the initial temperature, and k is a constant. After 6 minutes, the object
has a temperature of 85° Fahrenheit. What is the approximate value of k? Round to four decimal
places.

A) 0.0119
B)0.2811
C)-0.2811
D)0.0209?