Voluntary exchange refers to an act of trading between individuals that makes both parties to the trade subjectively better off.
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The fewest number of hours from the graph is 73 hours.
<h3>Equation</h3>Equation is an expression used to show the relationship between two or more numbers and variables.
Let x represent the number of $10 course and y represent the number of $15 course.
Her goal is to save at least $1000, hence:
- 10x + 15y ≥ 1000 (1)
Also:
- x + y ≤ 80 (2)
The fewest number is (20, 53)
The fewest number of hours from the graph is 73 hours.
Find out more on equation at: brainly.com/question/2972832
