Question text
which volume formula or formulas show(s) a joint variation?

i v=8^3

ii v=πr^2h

iii v=bh

select one:
a. iii only
b. i only
c. ii and iii only
d. i, ii, and iii

1. V = s3 
2. V = pr2h 
3. V = Bh 

Joint variation means that V will be dependent on at least two different variables. Looking at the three choices, only 2 and 3 show this. 

In 2, V varies jointly as r2 and h (assuming p is the constant of proportionality). And in 3, V varies jointly as B and h, with the proportionality constant being 1.

The correct awnser is 29.76 pounds.