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  • 06-02-2018
  • Mathematics
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If the volume of the planter is 3,072 cubic inches, how tall is the planter?

If the volume of the planter is 3072 cubic inches how tall is the planter class=

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abscisa15
abscisa15 abscisa15
  • 06-02-2018

[tex]\it \mathcal{V} =\dfrac{\mathcal{A}_b\cdot h}{3} \Rightarrow h = \dfrac{3\mathcal{V}}{\mathcal{A}_b}= \dfrac{3\cdot3072}{\mathcal{A}_b}\ \ \ \ \ (*) \\\;\\ \\\;\\ \mathcal{A}_b = \dfrac{\ell^2\sqrt3}{4} = \dfrac{16^2\sqrt3}{4} =\dfrac{16\cdot16\sqrt3}{4} =4\cdot16\sqrt3=64\sqrt3\ \ \ \ (**) \\\;\\ \\\;\\ (*),\ (**) \Rightarrow h=\dfrac{3\cdot3072}{64\sqrt3} = \dfrac{3\cdot48}{\sqrt3} = \dfrac{\sqrt3\cdot\sqrt3\cdot48}{\sqrt3} = 48\sqrt3\ inches[/tex]


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