Solve the System $\begin{array} { l } 4 x - 7 y - z = - 17 \\x + 3 y - 5 z = - 9 \\3 x + y + z = 21\end{array}$

question 439

Multiple Choice

Solve the system.
$\begin{array} { l } 4 x - 7 y - z = - 17 \\x + 3 y - 5 z = - 9 \\3 x + y + z = 21\end{array}$

• A) \(\varnothing\)
• B) \(\{ ( 4,5,4 ) \}\)
• C) \(\{ ( - 4,4,8 ) \}\)
• D) \(\{ ( 4,4,5 ) \}\)

Evaluate the effectiveness of pollution control methods considering cost and social impacts.

Recognize the role of government intervention in controlling externalities and promoting environmental protection.

Analyze the impact of sorting requirements in recycling programs on the efficiency and costs of waste management.

Understand the concept of social discount rate and its application in policy evaluation.

---

Definitions:

Percent Change

The rate at which a quantity increases or decreases compared to its original value, expressed as a percentage.

Sales in 100s

Typically refers to a reporting method in which sales figures are rounded and represented in hundreds.

Annual Dividend

A payment made by a corporation to its shareholders, usually as a distribution of profits on an annual basis.

Quarterly Dividend

A dividend payment made by a corporation to its shareholders every three months or four times a year.