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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