Find the Center and the Radius of the Sphere That $$x ^ { 2 } + y ^ { 2 } + z ^ { 2 } - 4 x + 8 y = 0$$

question 28

Multiple Choice

Find the center and the radius of the sphere that has the given equation.
$$x ^ { 2 } + y ^ { 2 } + z ^ { 2 } - 4 x + 8 y = 0$$

• A) \(( 2 , - 4,0 ) , 2 \sqrt { 5 }\)
• B) \(( - 2,4,0 ) , 20\)
• C) \(( - 2,4,0 ) , 2 \sqrt { 5 }\)
• D) \(( 2 , - 4,0 ) , 20\)

---

Definitions:

Emerging Market Country

Refers to a nation with social or business activity in the process of rapid growth and industrialization.

Brazil

A South American country known for its diverse culture, rainforest, and large economy, also a significant player in global agricultural and energy markets.

Commercial Paper

An unsecured, short-term debt instrument issued by companies to finance their immediate needs.

Large Well-Known Companies

Corporations that are widely recognized and established, often characterized by a significant market presence and a high volume of sales.