Answer:
b
Explanation:
The sum of the interior angles of a polygon is
sum = 180° (n - 2) ← n is the number of sides
Here n = 5, thus
sum = 180° × 3 = 540°
Sum the given angles and equate to 540
90 + 148 + 3x + 10 + x + 112 = 540, that is
360 + 4x = 540 ( subtract 360 from both sides )
4x = 180 ( divide both sides by 4 )
x = 45 → b