Chapter 8.CR, Problem 1CR

To determine

a.

To draw:

A segment without measuring device approximately $10\text{cm}$ long

Answer to Problem 1CR

Solution:

The $10\text{cm}$ long segment is

$\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$.

Explanation of Solution

Two centimeters is approximately the distance between a joint of the thumb to the tip of the thumb.

So, by using this measurement, draw a segment $10\text{cm}$ long.

Therefore, the segment is

$\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$.

To determine

b.

The length of the segment, $\_\_\_\_\_\_\_\_\_\_\_\_\_\_$, to the nearest tenth $\text{cm}$

Answer to Problem 1CR

Solution:

The length of the given segment to the nearest segment is $1.9\text{cm}$.

Explanation of Solution

With the help of the scale, measure the length of the given segment.

The length of the segment is $1.9\text{cm}$.

Therefore, the length of the given segment to the nearest tenth $\text{cm}$ is $1.9\text{cm}$.

To determine

c.

To find:

The average number of miles an average American walks per gallon of alcohol in a year.

Answer to Problem 1CR

Solution:

The average number of miles per gallon for an average American is $41\text{mi/gal}$.

Explanation of Solution

Given information:

The average American walks $900$ miles a year and consumes approximately $22$ gallons of alcohol per year.

Calculation:

The average number of miles per gallon for an average American: $=\frac{\text{number of miles an average}\text{American}\text{walks}\text{per}\text{year}}{\text{number of gallons of alcohol}\text{consumed}\text{per year}}$.

Substitute the values of an average that an American walks a year and alcohol drinks per year,

The average number of miles per gallon for an average American:

$=\frac{900}{22}=40.90\approx 41\text{mi/gal}$.

Final statement:

The average number of miles per gallon for an average American is $41\text{mi/gal}$.