Answer:
[tex] Total cost = 9 + \frac{14 dollars}{hour} *1 hour = 9+14 = 23 dollars[/tex]
Explanation:
For this case let's define some notation:
y = Amount of money earned
x = Number of hours working
For this case if we assume that we have a linear relationship between the amount of money and the time t in hours working we have the following relationship:
[tex] y = 14 \frac{dollars}{hour} x[/tex]
And we want to find the cost of skipping practice and going to the carnival including the oportunity cost time.
So we have the following formula for the total cost:
[tex] Total cost = Opportunity cost +Variable costs[/tex]
Based on the information the person slip 1 hour long practice so on this case we have a cost of 14*1 =14$ dollars and the other cost is the associated to the amount of money spent at the carnival 9$.
And for this case then if we analyze the situation we can replace and we got:
[tex] Total cost = 9 + \frac{14 dollars}{hour} *1 hour = 9+14 = 23 dollars[/tex]