Write the Complex Number in Polar Form $$- 15 + 20 \mathrm { i }$$

question 147

Multiple Choice

Write the complex number in polar form. Express the argument in degrees, rounded to the nearest tenth, if necessary.
- $$- 15 + 20 \mathrm { i }$$

• A) \(25 \left( \cos 53.1 ^ { \circ } + i \sin 53.1 ^ { \circ } \right)\)
• B) \(25 \left( \cos 126.9 ^ { \circ } + i \sin 126.9 ^ { \circ } \right)\)
• C) \(25 \left( \cos 306.9 ^ { \circ } + i \sin 306.9 ^ { \circ } \right)\)
• D) \(25 \left( \cos 233.1 ^ { \circ } + \mathrm { i } \sin 233.1 ^ { \circ } \right)\)

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Definitions:

Pavlovian Conditioning

The association of a response with an environmental event as the result of pairing that event (conditioned stimulus, or CS) with a biologically significant event (unconditioned stimulus, or UCS).

Operant Conditioning

When a specific response produces reinforcement and the frequency of the response determines the amount of reinforcement obtained.

Learned Helplessness

A condition in which an individual learns to feel powerless and stops trying to change or escape a negative situation due to past failures.

Seligman

Martin E.P. Seligman, a psychologist known for his work on learned helplessness and for promoting positive psychology.