Highways the Graph Is Shown

question 67

Multiple Choice

$$\text { The rational function } f ( x ) = \frac { 120 x } { 100 - x } \text { models the cost, } f ( x ) \text {, in millions of dollars, to remove } x \% \text { of the trash from American }$$ highways. The graph is shown. Use the equation to solve the problem.

-Find and interpret f(80) .

• A) 48; The cost to remove 80% of the trash is $48 million.
• B) 48; The cost to remove 20% of the trash is $48 million.
• C) 48; The cost to remove 80% of the trash is $48 .
• D) 20; The cost to remove 80% of the trash is $20 million.

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Definitions:

Scientific Method

A systematic, organized series of steps that helps ensure objectivity and consistency in exploring a social or scientific problem.

Research Process

The systematic steps followed to collect and analyze information to increase our understanding of a topic or issue.

Issue of Interest

The specific concern or topic that is being studied or analyzed in a research project.

Independent Variable

The variable in an experiment or study that is manipulated or changed to observe its effect on the dependent variable.