Write the Complex Number in Rectangular Form $9 \left( \cos 180 ^ { \circ } + i \sin 180 ^ { \circ } \right)$

question 108

Multiple Choice

Write the complex number in rectangular form.
- $9 \left( \cos 180 ^ { \circ } + i \sin 180 ^ { \circ } \right)$

• A) \(- 9\)
• B) \(- 9 \mathrm { i }\)
• C) 9
• D) \(9 \mathrm { i }\)

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Definitions:

Mechanical Ventilation

A method of providing respiratory support using a machine (ventilator) to push air into and pull air out of the lungs of a patient who is unable to breathe adequately on their own.

Respiratory Rate

The number of breaths a person takes per minute, an important vital sign.

Tachypnea

Abnormally fast respirations, usually more than 24 respirations per minute.

Patent Airway

A clear and unobstructed passageway for air to move in and out of the lungs.