120.25 I just divided the figure into smaller shapes, found the value and then I added the areas together! :)
Given:
The square base pyramid with height 3 cm and base edge 2 cm.
To find:
The volume of the square pyramid.
Solution:
Volume of a square base pyramid is:
...(i)
Where, B is the base area and h is the height of the pyramid.
Base is a square with edge 2 cm, so the base area is:

Where, a is the edge of the square base.


Putting
in (i), we get
Therefore, the volume of the given pyramid is 4 cm³.
The tank of gas will have a density of 35g
The percent increase is 12.5%, 800 multiplied by 0.125 equals 100 and 100+800=900.