Answer:
x = 144
Step-by-step explanation:
The sum of the interior angles of a polygon is
sum = 180° (n - 2) ← n is the number of sides
here n = 7, hence
sum = 180° × 5 = 900°
Sum the given angles in the polygon and equate to 900
142 + 112 + 128 + 130 + 152 + 92 + x = 900, that is
756 + x = 900 ( subtract 756 from both sides )
x = 144
