They... for the trip to London.
A) live
B) leaves
C) was leaving
D) are leaving
E) lived

Умоляю помогите.Найдите область определения функции 1)у=√5х-2 2)у=(5х+2)/(4-х) 3)у=√(8-х) 4)у=(х-1)/((-4х+5)(-4х-3)) 5)у=(4х-3)/(2-5х) 6)√(2-3х) 7)(4х-5)/((2-7х)(4х+1)) 8)(х-4)/(5-х) 9)(-4х-5)/(х+2)(5х-2) 10)у=√(5х-2) 11)(4х+5)/(х-3)