I feel like I'm doing this question wrong. It seems too simple. Can I have a second and third opinion?

Step-by-step explanation:
Your answer is correct. The mean distance is half of the length of the major axis. So a = 58 million miles.
Answer:
I don't think you're doing this wrong
Step-by-step explanation:
You do everything right (Only because you're a super moderator, engagement team member, and a 100% super genius) Why else would someone that's a super moderator, engagement team member and a 100% genius would do a question wrong! And you know that when you're right you're Right!