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Can someone help me with 12 & 13. And show your work!

Can someone help me with 12 & 13. And show your work!-example-1

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Answer:

please see answers below

Explanation:

Volume of sphere = (4/3) X π X r ³

volume of hemisphere = (2/3)X π X r ³

12) volume of hemisphere = (2/3)X π X r ³

= (2/3) X π X (5)³

= (250/3)π

= 261.80 km³ to nearest hundredth

13) 18 foot is the diameter. radius = 1/2 X diameter = 9.

volume of hemisphere = (2/3)X π X r ³

= (2/3) X π X (9) ³

= 1526.81 ft³ to nearest hundredth

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