To write the number 0.000086 in scientific notation, follow these steps:
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Move the decimal point to the right until you have a number between 1 and 10. For 0.000086, moving the decimal point 5 places to the right gives you 8.6.
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Count how many places you moved the decimal. In this case, you moved it 5 places to the right, which indicates a negative exponent because the original number is less than 1.
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Write the number in scientific notation format:
\[ 8.6 \times 10^{-5} \]
So, 0.000086 in scientific notation is:
\[ 8.6 \times 10^{-5} \]