Answer:
Option "D" is correct.
Step-by-step explanation:

To eliminate negatives
They are interchanged thus it gives us option D.
Answer: 1 11/15
Step-by-step explanation:
9/10 + 5/6
=
9 × 3
+--------
10 × 3
5 × 5
-------
6 × 5
=
27/30 + 25/30
=
27 + 25
-----------
30
=
52/30
=
52 ÷ 2
----------
30 ÷ 2
=
26/15
=
1 11/15
The constant in this case is the number without the variable, making the answer A)3.
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