Answer:
7/2 or 3.5 inches
Explanation:
The volume of the rectangle= 
length×width×height, so 
V=1/2×2×7/2 
V=1×7/2 
V=7/2 cubic inches 
 
Next, Volume of the cube= 
side^3, or side×side×side 
V=1/2×1/2×1/2 
V=1/8 cubic inches 
First question, 
To find how many cubes with the side of 1/2 length that fir into the rectangular prism, take: 
7/2÷1/8 
=7/2×8 
=28 cubes. As a result, there are 28 cubes that will fit into the prism 
Second question, 
The volume of the person is 7/2 cubic inches or 3.5 cubic inches. Hope it help!