\[- 30,\ - 28,\ - 26,\ldots\]
\[a_{1} = - 30;\ \ d = - 28 + 30 = 2\]
\[a_{28} = a_{1} + d(n - 1) =\]
\[= - 30 + 2 \cdot (27) = 24.\]
\[Ответ:24.\]