Write an Equation to Describe the Variation $r$ Varies Jointly as the Square of S and the Square

question 82

Multiple Choice

Write an equation to describe the variation. Use k for the constant of proportionality.
- $r$ varies jointly as the square of s and the square of $t$ .

• A) \(r = k s ^ { 2 } t ^ { 2 }\)
• B) \(r + s ^ { 2 } + t ^ { 2 } = k\)
• C) \(r = k + s ^ { 2 } + t ^ { 2 }\)
• D) \(r s ^ { 2 } t ^ { 2 } = k\)

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