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22 September, 15:30

A sphere has a radius of 2x + 4. Which polynomial in standard form best describes the total surface area of the sphere? Use the formula for the surface area of a sphere.

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  1. 22 September, 16:58
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    16pi (x^2) + 64pix + 16pi

    Step-by-step explanation:

    Surface area is 4 * pi * r^2. The radius is r.

    Plug in "2x+4" for r, to get the surface area.

    4 * pi * (4x^2 + 16x + 4) =

    16pi (x^2) + 64pix + 16pi
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