Chapter 8.9, Problem 3PPS

(a)

To determine

Draw the graph sales of soft ball and year.

Answer to Problem 3PPS

Graph is a straight line.

Explanation of Solution

Given data:

Table of baseball and softball sales and tennis ball sales

Formula used:

Slope intercept form:

  $y=mx+C$

Calculation:

Graph of baseball and softball,

  

Conclusion:

The graph is a straight line graph..

(b)

To determine

Sales in 2015.

Answer to Problem 3PPS

The sales of baseball and softball in 2015 is 391$ billions.

Explanation of Solution

Given data:

Table of baseball and softball sales and tennis ball sales

Formula used:

Slope intercept form:

  $y=mx+C$

Calculation:

The sales in 2015:

  $\begin{array}{l}m=\tan \theta =\frac{y_2-y_1}{x_2-x_1}\\ m=\frac{351-317}{2005-1999}\\ m=5.67\end{array}$

Intercept =11034

So equation is

  $\begin{array}{l}y=5.67x-11034\\ y=5.67(2015)-11034\\ y=391\end{array}$

The sales of baseball and softball in 2015 is 391$billions

Conclusion:

The sales of baseball and softball in 2015 is 391$billions.

(c)

To determine

Draw the graph of sales of tennis and year.

Answer to Problem 3PPS

There is a increment in the sales of tennis ball.

Explanation of Solution

Given data:

Table of baseball and softball sales and tennis ball sales

Formula used:

Slope intercept form:

  $y=mx+C$

Calculation:

Graph of sales of tennis v/s year

  

Conclusion:

There is a increment in sales of tennis ball.

(d)

To determine

Sales of tennis ball in2015.

Answer to Problem 3PPS

The sales of tennis in 2015 is 881$billions.

Explanation of Solution

Given data:

Table of tennis ball sales

Formula used:

Slope intercept form:

  $y=mx+C$

Calculation:

The of tennis in 2015:

Intercept=-2141

So equation is

  $\begin{array}{l}y=1.5x-2141\\ y=1.5(2015)-2141\\ y=881\end{array}$

The sales of tennis in 2015 is 881$billions

Conclusion:

The sales of tennis in 2015 is 881$billions.