Which of the following lists is ordered from least to greatest? -4, -1, -1.6, , 3.2 -4, -1, -1.6, 3.2, -4, -1.6, -1, , 3.2 -1, -1.6, -4, , 3.2

I'm not quite sure where your lines start and end on your answers.  There appear to be extra commas.  If your options are:
-4, -1, -1.6, 3.2

-4, -1, -1.6, 3.2

-4, -1.6, -1, 3.2

-1, -1.6, -4, 3.2

then the answer is the third one, or C
-4, -1.6, -1, 3.2

2+1=3 that’s your answer

Ithink the answer may be -7 by when dividing both sides by -3