Need help with algebra problem

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19 votes

Answer:

$option \: d \: 4.2 * {10}^( - 3)$

Explanation:

Multiplication,

$= 8.4 * {10}^( 8 ) * 5 * {10}^( - 11) \\ = 8.4 * 5 * {10}^(8 + ( - 11)) \\ = 4.2 * {10}^(8 - 11) \\ = 4.2 * {10}^( - 3)$

Vromanch answered Jul 27, 2022

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