2.09 cu yds
To cover that area to that depth - you would need just under 8 cubic yards of soil.
105 ft * 84 ft * 3 inches = 105/3 yards * 84/3 yards * 3/36 yards = 35 * 28 / 12 cubic yards = 245 cubic yards.
yards
You will need a minimum of 38.6 square yards of carpet to cover that area.
You will need about 463 cubic yards (around 594 tons) of gravel for this area.
The 'square feet' of area that it covers is 1,620/(depth of the mulch, in inches)
To cover that area to that depth - you would need just under 8 cubic yards of soil.
6 feet or 36 inches.
105 ft * 84 ft * 3 inches = 105/3 yards * 84/3 yards * 3/36 yards = 35 * 28 / 12 cubic yards = 245 cubic yards.
6.7 cubic yards.
yards
about 17 yards of concrete (it's sold by the cubic yard)
39.1116 cubic yards
15.833... [cubic] yards.
You will need at least 32 square yards of carpet to cover that area.
You will need a minimum of 38.6 square yards of carpet to cover that area.
You will need about 463 cubic yards (around 594 tons) of gravel for this area.