Answer:
[tex]\boxed{\tt d=5g/cm^3}[/tex]
Explanation:
The density of a substance can be found using the following formula.
[tex]d=\frac{m}{v}[/tex]
where [tex]m[/tex] is the mass and [tex]v[/tex] is the volume.
The mass of this substance is 90 grams and the volume is 18 cubic centimeters.
[tex]m= 90 g \\v= 18 cm^3[/tex]
Substitute the values into the formula.
[tex]d=\frac{90 g}{18 cm^3}[/tex]
Divide 90 grams by 18 cubic centimeters.
[tex]d=5 g/cm^3[/tex]
The density of the substance is 5 grams per cubic centimeter.