Answer
$\text{Leading Term: }
-t^3
\\\text{Leading Coefficient: }
-1$
Work Step by Step
In descending powers of the variables, the given expression, $
13+20t-30t^2-t^3
,$ is equivalent to
\begin{array}{l}\require{cancel}
-t^3-30t^2+20t+13
.\end{array}
The expression above has the following characteristics:
\begin{array}{l}\require{cancel}
\text{Leading Term: }
-t^3
\\\text{Leading Coefficient: }
-1
.\end{array}