I dont know what to do for number 6, please someone help/explain!

r= 16.65

Step-by-step explanation:

Formula of cone V= 1/3 pi r ^2 h

They give us the volume and height, we just need to find the radius.

85= 1/3 pi r^2 9

1/3 of 9 is 3.

85= 3 pi r^2

divide by 3 on both sides.

28.3= pi r^2

square both sides with calculator or logic and round to nearest tenth.

5.3= pi r

divide pi.

r= 5.3 pi = 16.65

To find volume, plug everything in the formula.

b

step-by-step explanation: