Solve the problem.The following graph indicates the hourly temperature in Riversbend, IL from 11 P.M. on March 6, 2008 to 7 A.M. on March 7, 2008. The function t(x) = -1.29x2 + 8.80x + 42.69 can be used to estimate the hourly temperature in Riversbend, where x is the number of hours after midnight. Use the graph to determine the hour that the temperature was a minimum.

A. 4 A.M.
B. 11 P.M.
C. 3 A.M.
D. 7 A.M.


Answer: B

Mathematics

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