To find the value of the expression -4(2.5a-1.5)+5.5a when a=-2/9, we first need to substitute a with -2/9 in the expression:

-4(2.5(-2/9)-1.5)+5.5(-2/9)
= -4( -5/9 - 1.5 ) + (-11/9)
= -4( -5/9 - 9/6 ) - 11/9
= -4( -5/9 - 9/6 ) - 11/9
= -4( -5/9 - 9/6 ) - 11/9
= -4( -5/9 - 9/6 ) - 11/9
= -4( -5/9 - 3/2 ) - 11/9
= -4( -17/18 ) - 11/9
= 17/2 - 11/9
= 19/2

Therefore, when a=-2/9, the value of the expression is 19/2.