the answer is $173.25( I had a question for this and i got it correct hope this helps)
C. Negative because since the neutral atom stands at 0 and positive ions are 1+ and electrons are negative if it gains the electron ( negative ) it will become negative.
This can be solved using a system of equations.

Subtract y from both sides.

Substitute:

Subtract 80 from both sides:

Divide both sides by 5:

Substitute.
Answer:
is there a picture of the question
Answer:
90 approximately because if AB is 80 then DC should be 90 because AB come before DC in letters