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 need to find the volume of the square pyramid and the rectangular prism.

V = 1/3 Bh (volume of pyramid); B is the area of the base.
      1/3 x 8 x 8 x 3
V = 64 cubic inches

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

256 cubic inches + 64 cubic inches = 320 cubic inches.

The entire volume is 320 cubic inches.

She can by 10 pens and 30 pencils at exactly 6.50