Sasha's grandmother loves to travel. she sends sasha postcards from all around the world. sasha keeps the postcards in a special box. the box has a square base and a square pyramid for a lid. what is the combined volume inside the box and lid?

To find the combined volume, you will find the volume of each figure separately and then add them together.  You will use the formulas for each polyhedra (3-D) shape.

V = 1/3 Bh (pyramid); B stands for the area of the base of the figure
V = 1/3 x 8 x 8 x 3
V = 64 cubic inches

V = Bh (prism)
     8 x 8 x 4
V = 256 cubic inches

256 + 64 = 320 cubic inches

The total volume of the box is 320 cubic inches.

Graph a should be your answer