Answer: 1981.5 miles
Explanation:
From the question, we are informed that when Theresa started her trip, her car was at 87,429.8 miles and that when she returns from her trip her car was at 89,411.3 miles.
The number of miles that Theresa drive on her trip will be:
= 89,411.3 miles - 87,429.8 miles
= 1981.5 miles