Iwill give you brainlest and 10 point's

a) To find the volume of a cube, you cube the side length.

So, that will be V = 9/2³ = 729/8 in³.

b) To find the volume of a rectangular prism, you multiply the length by the width by the height.

So, that is V = 18 * 9 * 9/2 = 729 in³.

c) To find how many times the smaller box can go into the larger one, you divide the larger one's volume over the smaller one's.

That is 729/(729/8) = 729*8/729 = 8 boxes.