\[\boxed{\text{4.\ 198}}\]
\[120\ м - высота\ вертолета.\]
\[\textbf{а)}\ 120 - 40 = 80\ м.\]
\[\textbf{б)}\ 120 + 60 = 180\ м.\]
\[\textbf{в)}\ 120 - 80 = 40\ м.\]
\[\textbf{г)}\ 120 + 140 = 260\ м.\]
\[\textbf{д)}\ 120 - 90 = 30\ м.\]
\[\textbf{е)}\ 120 + 20 = 140\ м.\]