It is determined that the temperature​ (in degrees​ Fahrenheit) on a particular summer day between​ 9:00a.m. and​ 10:00 p.m. is modeled by the function f(t)=−t2+5.7t+83​, where t represents hours after noon.   How many hours after noon does it reach the hottest​ temperature?

College Algebra
1st Edition
ISBN:9781938168383
Author:Jay Abramson
Publisher:Jay Abramson
Chapter3: Functions
Section3.4: Composition Of Functions
Problem 97SE: The number of bacteria in a refrigerated food product is given by N(T)=23T256T+1,3T33 ,where T is...
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It is determined that the temperature​ (in degrees​ Fahrenheit) on a particular summer day between​ 9:00a.m. and​ 10:00 p.m. is modeled by the function f(t)=−t2+5.7t+83​, where t represents hours after noon.
 
How many hours after noon does it reach the hottest​ temperature?
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