Answer
$86a^{5}b^{8}c^{3}$
Work Step by Step
$(8.6a^{4}b^{5}c)(10ab^{3}c^{2})=(8.6\times10)\times(a^{4}\times a)\times(b^{5}\times b^{3})\times(c\times c^{2})$
$=86\times a^{4+1}\times b^{5+3}\times c^{1+2}=86a^{5}b^{8}c^{3}$
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