Complete with the right sign: -9/11 -10/9 I I

either -20.01 or -1.79

Explanation:

-9/11-10/9=-20.01

9/11-10/9=-1.79 it is probably the 20.01 answer.

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.