(7x - 5) (10x + 15)
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  b║c

  c║d

Step-by-step explanation:

For x=10, the marked angles are ...

  (7x-5)° = (70 -5)° = 65°

  (10x +15)° = (100 +15)° = 115°

  (12x -5)° = (120 -5)° = 115°

  (8x -25)° = (80 -25)° = 55°

We notice that the alternate interior angles between lines c and d are congruent, so those lines are parallel. The acute angle at line b is supplementary to the obtuse angle at lines c and d, so line b is parallel to those two lines, as well.

The angle at line e is not related to any of the other angles, so that line is not parallel to any of the others shown.

  b║c║d

The answer choices appear garbled, but any choice involving 'a' or 'e' must be eliminated.

assuming you mean addition: addition and subtraction are reverse operations.

step-by-step explanation: