What is the factored form of (a^2-6) (a^2+4)

the answers that I can choose from are

a^4 + 2a^2 + 24

a^4 - 2a^2 + 24

a^4 - 2a^2 - 24

a^4 + 2a^2 - 24

Mara wants to use tiles to cover the bottom of a rectangular box that measures 24 inches long by 2 inches wide. She has 20 small square tiles with side lengths of 1 inch and 10 large square tiles with side lengths of 2 inches.

If the property tax on a 300,000 Is 2,220 what is the tax on a 100,000 home

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How is 2.725 x 10^-7 written in standard form

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