To determine which of the given options is equivalent to 185, let's evaluate each option one by one.
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815: This is simply the number 815, which is not equivalent to 185.
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8 Start Fraction 1 over 5 End Fraction: This represents \( 8 \times \frac{1}{5} = \frac{8}{5} = 1.6 \). This is also not equivalent to 185.
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8 exponent -5: This is \( 8^{-5} = \frac{1}{8^5} \). Calculating \( 8^5 = 32768 \), hence \( 8^{-5} = \frac{1}{32768} \), which is not equivalent to 185.
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8 exponent 5: This is \( 8^5 = 32768 \), which is not equivalent to 185.
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5 exponent -8: This is \( 5^{-8} = \frac{1}{5^8} \). Calculating \( 5^8 = 390625 \), so \( 5^{-8} = \frac{1}{390625} \), which is not equivalent to 185.
After evaluating all options, none of the provided choices is equivalent to 185.