Suppose each cube in this right rectangular prism is a 1/2 -inch unit cube. a. what are the dimensions of the prism? b. what is the volume of the prism?

A. So dimension is like the length, width, and height. The length is 2 cm (4 cubes), the width is 2 and a half cm (5 cubes), and the height is 1 and a half cm (3 cubes).
b. To get the volume you have to multiply the length and width by the height. Which would be 4 cubes (length)× 3 cubes (height)= 12 cubes. Then 5 cubes (width)×3 cubes (height)= 15 cubes. After you do that you have to multiply the two answers (12 cubes×15 cubes). So the answer is 180. I think this is right and I hope it helps. 

Wow. that is a really cool question.