Final answer:
The drama club must sell a minimum of 37 adult tickets in order to meet the show's expenses.
Step-by-step explanation:
To determine the minimum number of adult tickets that the drama club must sell in order to meet the show's expenses, we need to calculate the remaining amount that needs to be raised after selling the student tickets.
The drama club must make a minimum of $610 from ticket sales. Since 57 student tickets were sold at $5 each, the total revenue from student tickets is 57 * $5 = $285.
Therefore, the remaining amount that needs to be raised is $610 - $285 = $325.
Since each adult ticket sells for $9, we can calculate the minimum number of adult tickets that need to be sold by dividing the remaining amount by the price of an adult ticket:
$325 / $9 = 36.11 (rounded up to 37).
Therefore, the drama club must sell a minimum of 37 adult tickets in order to meet the show's expenses.