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?

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter8: Polynomials
Section8.1: Adding And Subtracting Polynomials
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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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