Question

Solve (2.5x10^-8)(9x10^-10)

Answer 1

(2.5×10⁻⁸)(9×10⁻¹⁰) = 2.5×9×10⁻⁸⁻¹⁰ = 22.5×10⁻¹⁸

= 2.25×10⁻¹⁷

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The rules of exponents apply.

... 10^a × 10^b = 10^(a+b)

... 22.5 = 2.25 × 10¹