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Answer:
Step-by-step explanation:
(5 * 10³) * (9*10⁷) = 5*9 * 10³⁺⁷
= 45 * 10¹⁰
= 4.5 * 10¹¹
(7*10⁵)÷ (2*10²) =
[tex]\frac{7}{2}*10^{5-2}\\\\=3.5*10^{3}[/tex]
