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mn - 4m - 5n + 20 = (mn - 5n) - (4m - 20) = n(m - 5) - 4(m - 5) = (m -5)(n - 4)
21 ft > 4 yds
There are 3 feet in 1 yard, so 4 yards is equal to 12 feet. Therefore the answer is both measurements are exactly the same.
less than
No because 4 yards equals 12 feet