
Concept explainers
To find multiple choice. And additional minutes must pass before it cools to 100 degree F.

Answer to Problem 52E
40 minutes additional minutes must pass before it cools to 100 degree F. Option (E).
Explanation of Solution
Given information: An apple pie comes out of the oven at 425 degree F and is placed on the counter in a 68 degree F. In 30minutes it has cooled to 195 degree F.
(A) 12.4
(B) 15.4
(C) 25.0
(D) 35.0
(E) 40.0
Calculation: The required solution is obtained as,
According to question,
Hence, 40 minutes additional minutes must pass before it cools to 100 degree F. Option (E).
Chapter 7 Solutions
Calculus 2012 Student Edition (by Finney/Demana/Waits/Kennedy)
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