Rewrite the Expression Using Only Positive Exponents, and Simplify $\frac { s ^ { - 1 } + r ^ { - 1 } } { s ^ { - 1 } - r ^ { - 1 } }$

question 63

Multiple Choice

Rewrite the expression using only positive exponents, and simplify. Assume that any variables in the expression are nonzero. $\frac { s ^ { - 1 } + r ^ { - 1 } } { s ^ { - 1 } - r ^ { - 1 } }$

• A) \(\frac { r - s } { r + s }\)
• B) \(s ^ { 2 } + r ^ { 2 }\)
• C) \(\frac { r + s } { r - s }\)
• D) \(\frac { s + r } { s - r }\)
• E) \(\frac { s - r } { s + r }\)

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