Answer:
y=84
Explanation:
They are all on a straight line. A straight line has 180 degrees. So you have to set the equation to 180.
54+42+y=180
Simplify
96+y=180
Subtract 96 from both sides.
y = 84°
54 + 42 = 96
180 - 96 = 84
84° is the missing value
Hope this helps!
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