Students in a fifth-grade class were given an exam. During the next 2 years, the same students were retested several times. The average score was given by the model f(t) = 81 – 21 log(t + 1), 0

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter4: Polynomial And Rational Functions
Section: Chapter Questions
Problem 5T
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Students in a fifth-grade class were given
an exam. During the next 2 years, the
same students were retested several
times. The average score was given by the
model
f(t) = 81 – 21 log(t + 1),
0<t< 24
where t is the time in months. Round
answers to 1 decimal place.
(a) What is the average score on the
original exam?
(b) What was the average score after 5
months?
(C) After how many months does the
average score drop below 53?
months
Transcribed Image Text:Students in a fifth-grade class were given an exam. During the next 2 years, the same students were retested several times. The average score was given by the model f(t) = 81 – 21 log(t + 1), 0<t< 24 where t is the time in months. Round answers to 1 decimal place. (a) What is the average score on the original exam? (b) What was the average score after 5 months? (C) After how many months does the average score drop below 53? months
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