The rate of change of annual U.S. factory sales (in billions of dollars per year) of a certain class of goods to dealers from 1990 through 2001 can be modeled as s(t) = 0.121 t2 + −1.02 t + 5.72 billion dollars per year where t is the number of years since 1990. Check: s(2)=4.164 (c) If factory sales were $43.5 billion in 1990, what were they in 1999? (Round your answer to three decimal places.) $ billion

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter9: Quadratic Functions And Equations
Section9.6: Solving Quadratic Equations By Using The Quadratic Formula
Problem 64PFA
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The rate of change of annual U.S. factory sales (in billions of dollars per year) of a certain class of goods to dealers from 1990 through 2001 can be modeled as

s(t) = 0.121 t2 + −1.02 t + 5.72 billion dollars per year

where t is the number of years since 1990.

Check: s(2)=4.164


(c) If factory sales were $43.5 billion in 1990, what were they in 1999? (Round your answer to three decimal places.)
$ billion
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The rate of change of annual U.S. factory sales (in billions of dollars per year) of a certain class of goods to dealers from 1990 through 2001 can be modeled as

s(t) = 0.12 t2 + −1.02 t + 5.7 billion dollars per year
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