To simplify the expression \( 13^{-5} \cdot 13^{-11} \) using the properties of exponents, we can use the rule that states \( a^m \cdot a^n = a^{m+n} \).
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Add the exponents: \[ -5 + (-11) = -16 \] So, \( 13^{-5} \cdot 13^{-11} = 13^{-16} \).
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To express this with only positive exponents, we can use the property \( a^{-n} = \frac{1}{a^n} \): \[ 13^{-16} = \frac{1}{13^{16}}. \]
Therefore, the equivalent expression with only positive exponents is: \[ \frac{1}{13^{16}}. \]
So the correct response is: 1/13^16