Francine bought a cup of cocoa at the cafeteria. The cocoa cooled off rapidly at first, and then gradually approached room temperature. Which graph more accurately reflects the temperature of the cocoa as a function of time?
?
(a)
(b)
Explain why. (Select all that apply.)
A.
The graph has a steep negative slope at first, corresponding to an initial rapid drop in the temperature of the cocoa.
B.
The graph becomes closer to a horizontal line, corresponding to the cocoa approaching room temperature.
C.
The graph has a slight negative slope at first, corresponding to an initial rapid drop in the temperature of the cocoa.
D.
The graph becomes grows steeper and steeper, corresponding to the cocoa approaching room temperature.
E.
None of the above
Is the graph you chose concave up or concave down?
?
Concave up
Concave down