a rectangular prism has a height of 12 centimeters and a square base with sides measuring 5 centimeters. a pyramid with thee same base and half the height of the prism is placed inside the prism, as shown in the figure

a triangular prism is a 3 dimensional shape composed of triangles and rectangles. it is made from two triangular bases and three rectangular sides.  

6^2 or 36

step-by-step explanation:

6000n

6×1000n

6×10^3 n

so we need 6n need to be a perfect cube

so n has to be 6^2 so that 6n is 6^3

what i'm saying is if you let n be 6^2 you have 6^3×10^3 or 60^3 which is a perfect cube

answer is  

a.

7 in. x 11 in.

hope you get this right.