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Will someone please help with 4, 5, and 7??

Will someone please help with 4, 5, and 7??-example-1
User Malick
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v=(4/3)pir^2

4. r=7 ft so v=(4/3) x 3.14 x 7^2 = 205.1 ft.^3

5. r=18/2 = 9 so v=(4/3) x 3.14 x 9^2 = 339.0 mm^3

7. r = 3, so v=(4/3) x 3.14 x 3^2 = 37.7 cm^3

User Arno Chauveau
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