Question 9 of 15

(a) Write a cost function to represent the cost [tex]\( C(x) \)[/tex] for printing [tex]\( x \)[/tex] thousand pages for a given month.
[tex]\[ C(x) = 1875 + 50x \][/tex]

(b) Write a function representing the average cost [tex]\( \bar{C}(x) \)[/tex] for printing [tex]\( x \)[/tex] thousand pages for a given month.
[tex]\[ \bar{C}(x) = \frac{1875}{x} + 50 \][/tex]

(c) Complete the table. Round your answers to two decimal places, if necessary.

[tex]\[
\begin{tabular}{|c|c|c|c|c|}
\hline
x & 20 & 50 & 100 & 200 \\
\hline
\bar{C}(x) & \square & \square & \square & \square \\
\hline
\end{tabular}
\][/tex]



Answer :

Let's solve the problem step by step.

The average cost function is given by:
[tex]\[ \bar{C}(x) = \frac{1875}{x} + 50 \][/tex]

### Part 3 of 4:
We need to fill in the table for different values of [tex]\( x \)[/tex] (in thousand pages) using the average cost function [tex]\(\bar{C}(x)\)[/tex].

Given values of [tex]\( x \)[/tex] are 20, 50, 100, and 200.

1. For [tex]\( x = 20 \)[/tex]:
[tex]\[ \bar{C}(20) = \frac{1875}{20} + 50 \][/tex]
Calculate [tex]\(\frac{1875}{20}\)[/tex]:
[tex]\[ \frac{1875}{20} = 93.75 \][/tex]
Then:
[tex]\[ \bar{C}(20) = 93.75 + 50 = 143.75 \][/tex]

2. For [tex]\( x = 50 \)[/tex]:
[tex]\[ \bar{C}(50) = \frac{1875}{50} + 50 \][/tex]
Calculate [tex]\(\frac{1875}{50}\)[/tex]:
[tex]\[ \frac{1875}{50} = 37.5 \][/tex]
Then:
[tex]\[ \bar{C}(50) = 37.5 + 50 = 87.5 \][/tex]

3. For [tex]\( x = 100 \)[/tex]:
[tex]\[ \bar{C}(100) = \frac{1875}{100} + 50 \][/tex]
Calculate [tex]\(\frac{1875}{100}\)[/tex]:
[tex]\[ \frac{1875}{100} = 18.75 \][/tex]
Then:
[tex]\[ \bar{C}(100) = 18.75 + 50 = 68.75 \][/tex]

4. For [tex]\( x = 200 \)[/tex]:
[tex]\[ \bar{C}(200) = \frac{1875}{200} + 50 \][/tex]
Calculate [tex]\(\frac{1875}{200}\)[/tex]:
[tex]\[ \frac{1875}{200} = 9.375 \][/tex]
Then:
[tex]\[ \bar{C}(200) = 9.375 + 50 = 59.38 \][/tex]

Now, we can fill in the table as follows:

[tex]\[ \begin{array}{|c|c|c|c|c|} \hline x & 20 & 50 & 100 & 200 \\ \hline \bar{C}(x) & 143.75 & 87.5 & 68.75 & 59.38 \\ \hline \end{array} \][/tex]

So the table with completed values is:

[tex]\[ \begin{array}{|c|c|c|c|c|} \hline x & 20 & 50 & 100 & 200 \\ \hline \bar{C}(x) & 143.75 & 87.5 & 68.75 & 59.38 \\ \hline \end{array} \][/tex]