Use a Calculator to Find the Approximate Value of the Expression

question 282

Multiple Choice

Use a calculator to find the approximate value of the expression rounded to two decimal places.
- $\cos 72 ^ { \circ }$

• A) \(0.36\)
• B) \(- 0.92\)
• C) \(- 0.97\)
• D) \(0.31\)

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Definitions:

Narcolepsy

A neurological disorder that affects the control of sleep and wakefulness, leading to excessive daytime sleepiness and uncontrollable sleep attacks.

Awake

The state of being conscious and aware of one's surroundings, as opposed to being asleep.

Sleep

A naturally recurring state of mind and body characterized by altered consciousness, relatively inhibited sensory activity, reduced muscle activity, and inhibition of nearly all voluntary muscles during rapid eye movement (REM) sleep.

Consolidation

The process by which memories become stable in the brain; a process believed to involve the strengthening of the neural connections that form memories.