Answer:
depending on how many days he runs you multiply by three see since he only ran one day he only ran 3 miles lest say he ran for 5 days in a row he has ran 15 miles in total because 5x3=15 so the equation would be 3x
Explanation:
1:3, for every day he runs 3 miles
1:3
2:6
3:9
ect
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