The temperature at 5 A.M. on a certain December day was measured at 18°F. In the next t hr, the temperature was given by the function
?
?
where T is measured in degrees Fahrenheit. At what time was the temperature 0 °F?
?
_____ : _____ P.M.
What will be an ideal response?
7; 47
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A. 
B. 
C. 
D. 