The definition of density is given by:
D = m / V
Where,
m: mass
V: volume
The volume of the rectangular prism is given by:
V = (0.3) * (2.1) * (0.1)
V = 0.063 mi ^ 3
Substituting the values:
D = 0.07 / 0.063
D = 1.111111111 Kg / mi ^ 3
Round to the nearest tenth:
D = 1.1 Kg / mi ^ 3
Answer:
the density of the board is:
D = 1.1 Kg / mi ^ 3
