Tell Whether a Linear Model or a Quadratic Model Is $x ^ { 2 }$

question 400

Multiple Choice

Tell whether a linear model or a quadratic model is appropriate for the data. If linear, tell whether the slope should be positive or negative. If quadratic, decide whether the leading coefficient a of $x ^ { 2 }$ should be positive or negative.
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• A) quadratic; negative
• B) linear; positive
• C) linear; negative
• D) quadratic; positive

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Definitions:

HIV

Human Immunodeficiency Virus, a virus that attacks the immune system and can lead to AIDS if not treated.

Child

A young human being below the age of puberty or below the legal age of majority.

Course Of AIDS

The progression of HIV/AIDS, spanning from the initial infection, through various stages of symptomatic and asymptomatic periods, to the potential end stage known as Acquired Immunodeficiency Syndrome (AIDS).

Initial Infection

The first stage of an infection after the entry of the pathogen into the host, often characterized by the initial onset of symptoms.