Question 23473
Multiply the integers then apply the "product of powers" principle: 
"Product of powers"...To multiply two powers that have the same base, add the exponents.
{{{(9m^3n^5)(-2mn^2)}}}  Remember that {{{m = m^1}}}
{{{(9)(-2)(m^(3+1))(n^(5+2))}}} = {{{-18m^4n^7}}}