Answer
$-\dfrac{14}{10}$
Work Step by Step
The given expression, $
-\dfrac{9}{10}-\dfrac{1}{2}
$, simplifies to
\begin{array}{l}\require{cancel}
\dfrac{1(-9)-5(1)}{10}
\\\\=
\dfrac{-9-5}{10}
\\\\=
\dfrac{-14}{10}
\\\\=
-\dfrac{14}{10}
.\end{array}
