Answer:
2.2×10⁹
Step-by-step explanation:
The distributive property is useful here. Recognize that 10⁹ is a common factor:
(5.4×10⁹) - (3.2×10⁹) = (5.4 -3.2)×10⁹ = 2.2×10⁹
Answer: 2.2×10⁹
