Solve the Problem $\{ x \mid 21 < x < 19 \}$

question 179

Multiple Choice

Solve the problem.
-The revenue achieved by selling x graphing calculators is figured to be x(39 - 0.2x) dollars. The cost of each calculator is $27. How many graphing calculators must be sold to make a profit (revenue - cost) of at least
$160.00?

• A) \(\{ x \mid 21 < x < 19 \}\)
• B) \(\{ x \mid 5 < x < 25 \}\)
• C) \(\{ x \mid 20 < x < 40 \}\)
• D) \(\{ x \mid 22 < x < 38 \}\)

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Definitions:

Conclusion

The final part of something, typically a process or an argument, where the outcome or decision is reached.

Argument's Step

A component or stage in an argument where a claim is made and supported by evidence or reasoning.

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A style of parenting characterized by strict, demanding, and often punitive measures to control child behavior.

Middle Childhood

A developmental stage that typically covers the period from ages 6 to 12, focusing on the growth of social, cognitive, and physical abilities.