Chapter 7, Problem 29CR

To determine

To find: the pores are on the back of hand and to write the answer in scientific notation.

Answer to Problem 29CR

The number of pores on the back side of hand in scientific notation is $7.8\times {10}^3\text{pores}$ .

Explanation of Solution

Given information:

Given square inch of body has about $6.5\times {10}^2$ pores. Suppose the back of hand has an area of about $0.12\times {10}^2{\text{in}}^2$ .

Calculation:

Given square inch of body has about $6.5\times {10}^2$ pores. Suppose the back of hand has an area of about $0.12\times {10}^2{\text{in}}^2$ .

The amount of pores on the back side of hand is

  $\begin{array}{c}\left(0.12\times {10}^2\right)\times \left(6.5\times {10}^2\right)=0.12\times 6.5\times {10}^{2+2}\\ =0.78\times {10}^4\\ =7.8\times {10}^3\text{pores}\end{array}$

The number of pores on the back side of hand in scientific notation is $7.8\times {10}^3\text{pores}$ .