Solve the Problem $R$ Varies Directly As $x ^ { 2 }$

question 174

Multiple Choice

Solve the problem.
- $R$ varies directly as $x ^ { 2 }$ and inversely as $t$ when $R = 30$ when $x = 6$ and $t = 12$ . Find $R$ when $x = 7$ and $t = 9$ .

• A) \(R = \frac { 9 } { 490 }\)
• B) \(R = \frac { 490 } { 9 }\)
• C) \(R = \frac { 3 } { 140 }\)
• D) \(R = \frac { 140 } { 3 }\)

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Definitions:

Breathing

The physiological process of inhaling oxygen and exhaling carbon dioxide from the body's respiratory system.

Heartbeat

The rhythmic contraction of the heart, pumping blood through the body's circulatory system.

Temporal Lobe

A region of the brain responsible for processing auditory information and encoding memory, located at the sides of the brain beneath the temples.

Hearing

The sense and physiological process by which sound is perceived through vibrations in the ear.