A cup of coffee is left to cool inside a room and its' cooling can be described by the function y = 856.75)*5 + 15 where x is time in minutes and Tis the temperature of
the coffee in degrees Celsius.
A)
Fill in the table below:
(3)
0
5
10
15
20
X (time)
T
(Temperature)
B)
What is the initial temperature of the coffee?
{2}
C)
Enter the function in your calculator and determine when the coffee will be at
50°C? 20°C?
D)
13:
What will the temperature of the coffee eventually cool to and why?