Your question is nonsense as:
However, if you mean how many SQUARE miles are in 31/2 acres:
1 acre = 1/640 sq mi
→ 31/2 acres = 31/2 x 1/640 sq mi
= 7/1280 sq mi
≈ 0.0055 sq mi
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There are no miles in any acres, and no acres in any miles.1 square mile = 640 acres
1,024,000 acres.
14.0625 square miles in 9,000 acres.
Answer: 1,600 acres = 2.5 square miles.
3.90 square miles = 249,600 acres.