Question 1081004

A cup of coffee is heated to 180°F and placed in a room that maintains a temperature of 80°F. The temperature of the coffee after t minutes is given by 
T(t) = 80 + 115e^−0.042t.
(a) Find the temperature, to the nearest degree, of the coffee 25 minutes after it is placed in the room. 
 ______°F 

(b) Use a graphing utility to determine when, to the nearest tenth of a minute, the temperature of the coffee will reach 130°F.
After_____min 
<pre>Correct answers: {{{highlight_green(matrix(2,2, "a)", 120^o, "b)", 19.8))}}}