Final answer:
The inequality x ≥ 53 represents the situation where at least 53 people buy food from a lunch truck each day at lunchtime.
Step-by-step explanation:
To represent the situation where at least 53 people buy food from a lunch truck each day at lunchtime, you can write the inequality: x ≥ 53, where x represents the number of people buying food. This inequality states that the number of people buying food is greater than or equal to 53.
You can also graph this inequality on a number line by marking a closed circle at the point 53 and shading the region to the right of 53, indicating that the number of people is greater than or equal to 53.