Answer :

Lilith
[tex](6a^4bc)(7ab^3c)= 6\cdot 7\cdot a^4\cdot a\cdot b \cdot b^3\cdot c\cdot c =\\ \\ =42\cdot a^{4+1}\cdot b^{1+3}\cdot c^{1+1}=42a^5b^4c^2[/tex]


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