8x + 16 =6x
16 = 6x-8x
16 = -2x
X=-8
first is false and second is also false all ate false
Recall that the interior angles of a quadrilateral add up to 360 degrees.
1) Let x be the measure of the missing angle, then we can set the following equation:

Solving for x we get:

2) Let y be the measure of the missing angle, then we can set the following equation:

Solving for y we get:

Answer:
1) 100 degrees.
2) 58 degrees.
Probably c or d it will probably be wrong though