Verified answer

1) x²y² = (xy)²

2) - 125m³n³ = (- 5)³m³n³ = (- 5mn)³

3) 32p⁵q⁵ = 2⁵p⁵q⁵ = (2pq)⁵

4) 1 000 000 000a⁹b⁹c⁹ = 10⁹a⁹b⁹c⁹ = (10abc)⁹