Question 468016: points) A large office building is having its old, single pane windows replaced with double pane windows. The company replacing the windows charges $600 for the service call. Since all of the windows are identical in size, the company agreed to charge the same price for each, even though some were not at ground level. The charge to replace each window is $400+Z (remember, Z is the last 2 digits of your IRN).
a. Write an expression that gives the total cost to replace x windows
Answer by ccs2011(207)   (Show Source):
You can put this solution on YOUR website! Total cost can be broken down into fixed cost and variable cost.
Fixed cost is independent of the variable x, or in other words doesn't depend on the number windows replaced.
Variable cost is dependent on x and is a unit cost or cost per window.
For this problem the service call represents the fixed cost because they charge the same $600 no matter how many windows are replaced.
The variable cost is the $400+Z which is the cost for each window.
Since x represents the number of windows to be replaced then the cost of replacing x windows is as follows:
C(x) = 600 + (400+Z)x
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