Answer:
f = 52°
Explanation:
the 2 angles are adjacent and therefore supplementary, thus
f + 128° = 180° ( subtract 128° from both sides )
f=52 degrees
If I see the problem correctly the other number is 128 if so then you can use the DLD thm. That says 180=angle+angle in a linear pair. So that means that here it's 180=128+f. Substract 128 from each side to get x alone and that gets you f=52. (Angle is degree so add degree sign)
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