How to simplify $(2.4 * 10^–5)(4 * 10^–4)$ in scientific notation?

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Answer 1 · 2015-11-03T12:26:16

$9.6 times 10^(-9)$

$2.4 times 4 times 10^(-5) times 10^(-4)$

$9.6 times 10^(-5-4)$

$9.6 times 10^(-9)$

How to simplify (2.4 * 10^–5)(4 * 10^–4)(2.4 * 10^–5)(4 * 10^–4) in scientific notation?