Answer
$50m+90n+10$
Work Step by Step
Using the Distributive Property which is given by $a(b+c)=ab+ac,$ the expression, $
10(5m+9n+1)
,$ is equivalent to
\begin{array}{l}\require{cancel}
10(5m)+10(9n)+10(1)
\\\\=
50m+90n+10
.\end{array}
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