Answer:
D
Step-by-step explanation:
Sign means equal to or less then. Judging off the word problem saying "at least" it means that that they have that amount of trips or more.
B. 24 + t ≥ 48
So the keyword is at least which makes it clear that 24 + t is at least 48, which would be the same as is greater than or equal to
hope this helps:)
