Chapter 1.3, Problem 30IP

To determine

Write an expression that can be used to find the total cost to have photographs taken, then find the cost of purchasing twelve portrait sheets.

Answer to Problem 30IP

  $\begin{array}{l}25+7p\\ \$109\end{array}$

Explanation of Solution

Given:

A studio charges a sitting fee of $25 plus $7 For each portrait sheet ordered.

In order to write an expression that can be used to find the total cost to have photographs taken, then find the cost of purchasing twelve portrait sheets, let p be the number of portrait sheet, first the starting cost is $25 to which adding $7 per photo, this implies that multiplying the number of portraits by 7 and then add on the starting cost so, the expression is as shown below:

  $25+7p$

Now, to find the cost of purchasing 12 portrait sheets, first in the above expression putting the value of p, that is 12 then solving it as shown below:

  $\begin{array}{l}25+7p\\ =25+7\times 12\\ =25+84\\ =109\end{array}$

So, the expression is $25+7p$ , and the cost of purchasing twelve portrait is $109.