Question

the thickness of the skin on the human back is about $3 \times 10^{-3}$ meter. the thickness of the skin on the human eyelid is about $3 \times 10^{-4}$ meter. how many times as thick is the skin on the human back as on the human eyelid?
0.1
10

Explanation:

Step1: Set up division ratio

$\frac{3 \times 10^{-3}}{3 \times 10^{-4}}$

Step2: Simplify coefficient first

$\frac{3}{3} = 1$

Step3: Simplify power of 10

$10^{-3 - (-4)} = 10^{1} = 10$

Step4: Multiply results

$1 \times 10 = 10$

Answer:

10