They are always on a coplanar
The volume of a cone is (1/3) that of its similar cylinder.
Thus the volume of the cone B would be:
why?
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Isolate x by adding 8 to both sides.
3 = x/3
Then, multiply by 3 on both sides.
9 = x
To prove that this is right, you can imput 9 into the equation and it equals -5.