2) -1 2/7 : (-81/140)

1. Convert the mixed number to an improper fraction: -1 2/7 = -9/7.
2. Change division to multiplication by the reciprocal of the second fraction: (-9/7) * (-140/81).
3. Multiply and simplify: (9 * 140) / (7 * 81) = 1260 / 567 = 20/9 = 2 2/9.