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A human hair was measured to have a diameter of [tex]3.15 \times 10^{-3}[/tex] inches. The width of a piece of paper was measured to be [tex]3.94 \times 10^{-3}[/tex] inches thick.

In scientific notation, how much thicker is the piece of paper than the hair?

A. [tex]0.79 \times 10^{-6}[/tex] inches
B. [tex]7.9 \times 10^{-4}[/tex] inches
C. [tex]0.79 \times 10^{-3}[/tex] inches
D. [tex]7.9 \times 10^{-2}[/tex] inches

Answer :

The piece of paper is thicker than the human hair by 0.79 x 10 ^ -3 inches, which is the difference obtained when subtracting the width of the hair from the paper.

The question is asking how much thicker a piece of paper is compared to a human hair. To find this, you need to subtract the width of the human hair from the width of the paper.

The width of the piece of paper in scientific notation is 3.94 x 10 -3 inches and the width of the human hair is 3.15 x 10 -3 inches. Subtract the width of the human hair from the width of the paper:

This equals 0.79 x 10-3 inches. That is the difference between the thickness of the paper and the human hair. So, the correct answer is 0.79 x 10 ^ -3 inches.

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