What is the density of an object having a mass of 4.0 g and a volume of 39.0 cubic centimeters

Density is mass per unit volume.

$${\mathtt{density}} = {\frac{{\mathtt{4}}}{{\mathtt{39}}}} \Rightarrow {\mathtt{density}} = {\mathtt{0.102\: \!564\: \!102\: \!564\: \!102\: \!6}}$$

density ≈ 0.103 g/cc