8) Since the labels just cover the sides...
A=2πrh and the difference between these two labels will then be:
A=2π(1.5*4.5-1*3)
A=2π(6.75-3)
A=7.5π in^2
A≈23.56 in^2 (to nearest hundredth of a square inch)
9)
V=hπr^2 (the picture appears to show diameters and not radii so)
V=(hπd^2)/4
Since the volume is proportional to hd^2 we can just see when that product is equal...
4^2(h)=6^2(6)
16h=216
h=13.5 in