Answer:
35 +3n
Explanation:
because 70 divided by 2 is 35 and you dont know in so you ad 35 +3n
y = 3n + 70 - 35 or y = 3n + 35
you get 3n bc she gets 3 rocks per hike(n)
you get 70 - 35 or just 35 bc she started with 70 then gave half away and half of 70 is 35
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