Final answer:
The monominal that represents the cube of the given expression is 0.001a³.
Step-by-step explanation:
The given expression is x²+1.2x10^(-2)x-6.0x10^(-3).
To find the monominal which represents the cube of this expression, we need to cube each term in the expression.
The cube of x² is x^6, the cube of 1.2x10^(-2)x is (1.2x10^(-2)x)^3, and the cube of -6.0x10^(-3) is (-6.0x10^(-3))^3.
Therefore, the monominal that represents the cube of the given expression is option d) 0.001a³.