Due by 11: 30 pm tonight
a ball has a diameter of 9 in. it consists of 2 parts. the inside is a spherical core with a diameter of 6 in. surrounding the core is a layer of polyurethane.

what is the volume of the polyurethane?

use 3.14 to approximate pi. round to the nearest hundredth if necessary.

Ballvolume-corevolume=polyutheanevolume

volumesphere=(4/3)pir³

diameter/2=radius
ballradius=9/2=4.5
coreradius=6/2=3
ballvolume-corevolume=
(4/3)pi4.5³-(4/3)pi3³=
(4/3)(pi)(4.5³-3³)=
(4/3)(pi)(91.125-27)=
(4/3)(pi)(64.125)=
268.47 cubic inches

yah, it is 268.47 cubic inches

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.