Students must in order for a class trip to be scheduled, at least sign up. so far, 23 students have signed up. write and solve an inequality to find the least number of students that must sign up in order for the class trip to be scheduled. 30

I have added a screenshot with the complete question.

At least 7 more students need to sign up for the field trip to be scheduled

Explanation:
Assume that the least number of students remaining to register for the trip to be scheduled is x.

total number of students = students who already registered + x

We are given that, the least number of students required for this trip is 30. This means that:
total number of students ≥ 30
Now, we know that 23 students already registered. 

The inequality now is:
x + 23 ≥ 30
x ≥ 30 - 23
x ≥ 7

This means that at least 7 more students must register for the trip to be scheduled.

Hope this helps :)