Answer:
3. ( 1.5 × 10⁵ )
1.5 × (10×10×10×10×10)=100000
1.5 × 100000= 150000
2. ( 3 × 10⁴ ) ( 7.2 × 10²)
3× (10×10×10×10) × ( 7.2 × (10×10)
(3× 10000) (7.2 × 100)
3× 10000=30000 7.2 × 100= 720
30000×720= 21 600 000
