\[\boxed{\text{807\ (807).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[y = \left\{ \begin{matrix} - 2x + 4,\ \ x > 0 \\ 0,1x - 5,\ \ x \leq 0 \\ \end{matrix} \right.\ \]
\[1)\ y(3) = - 2 \cdot 3 + 4 =\]
\[= - 6 + 4 = - 2\]
\[2)\ y(0,001) = - 2 \cdot 0,001 + 4 =\]
\[= - 0,002 + 4 = 3,998\]
\[3)\ y(0) = 0,1 \cdot 0 - 5 = - 5\]
\[4)\ y( - 8) = 0,1 \cdot ( - 8) - 5 =\]
\[= - 0,8 - 5 = - 5,8\]