Question

Which volume formula or formulas show(s) a joint variation?

I V=lwh
II V=1/3πr^2h
III V=Bh

A-II and III only
B-I and III only
C-III only
D-I,II and III

Answer 1

It’s A

Explanation:
Given:
I. V=s^3
II.V=πr^2h
III. V=Bh
From the above
I. V varies directly as cube of s
II. V varies jointly as square of r and h where π is the constant of proportionality.
III. V varies jointly as B and h
Therefore, the volume formula which shows a joint variation are
II.V=πr^2h and III. V=Bh