\[\boxed{\text{350\ (350).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\ если\ x = - 6:\ \ \]
\[y = ( - 6)^{2} = 36\]
\[если\ x = 0,8:\ \]
\[y = (0,8)^{2} = 0,64\]
\[если\ x = - 1,2:\ \ \]
\[y = ( - 1,2)^{2} = 1,44\]
\[если\ x = 150:\ \ \]
\[y = 150^{2} = 22\ 500.\]
\[2)\ если\ y = 49:\ \ \]
\[x^{2} = 49\ \]
\[x = 7\ \ \]
\[x = - 7.\]
\[если\ y = 0:\ \ \]
\[x^{2} = 0\]
\[x = 0.\]
\[если\ y = 2500:\ \ \]
\[x^{2} = 2500\ \ \]
\[x = \pm 50.\]
\[если\ y = 0,04:\ \ \]
\[x^{2} = 0,04\ \ \]
\[x = \pm 0,2.\]