Weegy: The volume (v) of a sphere varies directly as the cube of its diameter (d)
Direct variation means v= c d^3 where c is a constant.
and d is the diameter
If you know the formula for the volume of a sphere (see above post)
V = (4/3) * pi * r^3 [ or (replace r with d/2)
V= ( pi/ 6 ) * d ^3
match
V= ( pi/ 6 ) * d ^3
with ^

V = c * d^3
]
User: The number of tons of coal burned by an old coal burning locomotive under given conditions varies as the number of hours. direct, inverse variation or niether?
Weegy: The number of tons of coal burned by an old coal burning locomotive under given conditions varies? This is an example of inverse variation. [smile]
(More)