A human hair has a diameter of about 4×10−3 inches. A fingernail is about 0.011 inches thicker. How thick is a fingernail? Write your answer as a decimal to 3 places.
To find the thickness of a fingernail, we add the thickness of a hair to the difference in thickness.
Thicker part of a fingernail = 0.011 inches + 4×10^(-3) inches
= 0.011 inches + 0.004 inches
= 0.015 inches
So, a fingernail is about 0.015 inches thick.