Final answer:
The equation that expresses the total cost of the semi-private lessons in terms of the number of students is Total Cost = $50 + ($20 x Number of Students).
Step-by-step explanation:
In order to determine the equation that expresses the total cost of the semi-private lessons in terms of the number of students in a class, we need to identify the fixed fee and the cost per student. According to the given information, the hang-gliding instructors are paid a fee of $50 per class. This represents the fixed fee. Additionally, they are paid $20 per student in the class, which represents the cost per student.
To express the total cost in terms of the number of students in a class, we can use the equation:
Total Cost = Fixed Fee + (Cost per Student x Number of Students)
Substituting the given values:
Total Cost = $50 + ($20 x Number of Students)
This equation allows us to calculate the total cost of the semi-private lessons based on the number of students in a class.