Perform the following operations and express your answers using the appropriate number of significant figures.
- 60.0 kg + 22.1 kg + 0.52 kg
- 8.75 ms − 750.0 μs
- ( 1.50 × 10 4 m/s ) × 120.0 s
- π ( 0.22 m² + 220 cm² )
- sin 65.0° × cos 25.05°