Simplify the Expression $\sqrt { - 21 }$ A) $21 i$ B) $i \sqrt { 21 }$

question 159

Multiple Choice

Simplify the expression. $\sqrt { - 21 }$

• A) \(21 i\)
• B) \(i \sqrt { 21 }\)
• C) \(- 21 i\)
• D) \(- i \sqrt { 21 }\)

Comprehend the use and setup of communication links between programming software and PLC hardware through RSLinx.

Understand the addressing structure used by ControlLogix controllers.

Acknowledge the importance and methods of organizing controller data and logic.

Distinguish between various types of tasks and their execution priorities.

---

Definitions:

Testimony

A formal statement made under oath, often used as evidence in court or other legal proceedings.

Formal Service

A process in legal proceedings that involves the official delivery of documents to inform a person of legal actions or proceedings against them.

Jurisdictions

The official power to make legal decisions and judgments, often referred to in context of geographical area or scope of legal authority.

Liability

The state of being legally responsible (liable) for something, such as a debt or obligation.