If a human hair has a diameter of about \(4 \times 10^{-3}\) inches, and a fingernail is about \(0.011\) inches thicker, we can calculate the thickness of a fingernail as follows:
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Start with the diameter of the human hair: \[ 4 \times 10^{-3} \text{ inches} \]
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Add the thickness of the fingernail: \[ \text{Fingernail thickness} = 4 \times 10^{-3} + 0.011 \]
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Convert \(0.011\) to a decimal: \[ 0.011 \text{ inches} = 0.011 \text{ inches} \]
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Calculate: \[ 0.011 \text{ inches} = 0.011000 \text{ inches} \] \[ 4 \times 10^{-3} = 0.004000 \text{ inches} \] \[ 0.004 + 0.011 = 0.015 \]
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Write the answer as a decimal to 3 places: \[ 0.015 \text{ inches} \]
So, the thickness of a fingernail is \(0.015\) inches.