Solve the Problem $x$ Graphing Calculators Is Figured to Be $x ( 28 - 0.2 x )$

question 149

Multiple Choice

Solve the problem.
-The revenue achieved by selling $x$ graphing calculators is figured to be $x ( 28 - 0.2 x )$ dollars. The cost of each calculator is $\$ 20$ . How many graphing calculators must be sold to make a profit (revenue - cost) of at least $\$ 75.00$ ?

• A) \(\{ x \mid 17 < x < 23 \}\)
• B) \(\{ x \mid 16 < x < 14 \}\)
• C) \(\{ x \mid 5 < x < 15 \}\)
• D) \(\{ x \mid 15 < x < 25 \}\)

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Definitions:

Clinical Research

The branch of medical science that determines the safety and effectiveness of medications, devices, diagnostic products, and treatment regimens intended for human use.

General Research

The organized exploration and examination of materials and sources to discover truths and draw fresh insights.

Ph.D. at Harvard

A doctoral degree awarded by Harvard University, signifying high-level achievement and research competence in a specific field of study.

Mary Salter Ainsworth

An American-Canadian developmental psychologist known for her work in early emotional attachment theory, particularly for the development of the "Strange Situation" assessment.