Answer:
To write an inequality to describe the situation where students receive a pizza, we need to use the concept of average.
The average of a set of numbers is equal to the sum of the numbers divided by the number of numbers. So, if the class has an average of at least 85 out of 100 correct questions on the mid term exam, we can write an inequality as:
(number of correct questions) / (number of students) ≥ 85/100
or
(number of correct questions) ≥ (85/100) * (number of students)
So the inequality that describes the situation where students receive a pizza is:
(number of correct questions) ≥ (85/100) * (number of students)
This inequality states that the number of correct questions must be greater than or equal to 85/100 multiplied by the number of students in order for them to receive a pizza.