Algebra and Trigonometry (6th Edition)
Algebra and Trigonometry (6th Edition)
6th Edition
ISBN: 9780134463216
Author: Robert F. Blitzer
Publisher: PEARSON
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Correlation
Correlation defines a relationship between two independent variables. It tells the degree to which variables move in relation to each other. When two sets of data are related to each other, there is a correlation between them.
Linear Correlation
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Regression Analysis
Regression analysis is a statistical method in which it estimates the relationship between a dependent variable and one or more independent variable. In simple terms dependent variable is called as outcome variable and independent variable is called as p…
Question

U.S. Energy Consumption Energy consumption
in the United States in quadrillion BTUs can be
modeled by C(x) = -0.013x2 + 1.281x + 67.147,
where x is the number of years after 1970.
a. One solution to the equation 87.567 = -0.013x2 +
1.281x + 67.147 is x = 20. What does this
mean?
b. Graphically verify that x = 20 is a solution to
87.567 = -0.013x2 + 1.281x + 67.147.
c. To find when after 2020 U.S. energy consumption
will be 87.567 quadrillion BTUs according to the
model, do we need to find the second solution to
this equation? Why or why not?

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