Question

Anyone????? That can help me answer these

Answer 1

5. 3050ft³ (rounded to 3 s.f.)

6. 4190ft³(rounded to 3 s.f.)

7. 4600ft³(rounded to 3 s.f.)

Formulas (For easier reference):

Volume of a cone: pi×r²×
`(h)/(3)`

Volume of cylinder: pi×r²×h

Volume of a sphere:
`(4)/(3)`×pi×r³

Volume of a hemisphere:
`(2)/(3)`×pi×r³

Explanation:

You can just apply the formulas to the question:

5. Volume of cone = pi×9²×
`((16-10))/(3)`

= 162pi

Volume of cylinder = pi×9²×10

= 810pi

Volume of figure = 162pi+810pi

= 972pi

= 3050ft³ (rounded to 3 s.f.)

6. Volume of sphere =
`(4)/(3)`×pi×10³

= 1333
`(1)/(3)`pi

= 4190ft³(rounded to 3 s.f.)

7. Volume of hemisphere =
`(2)/(3)`×pi×(26÷2)³

= 1464
`(2)/(3)`pi

= 4600ft³(rounded to 3 s.f.)