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 , then
sum = 180° × (5 - 2) = 180° × 3 = 540°
sum the five interior angles and equate to 540
148 + 3x + 10 + x + 112 + 90 = 540
4x + 360 = 540 ( subtract 360 from both sides )
4x = 180 ( divide both sides by 4 )
x = 45
Then
∠ B = 3x + 10 = 3(45) + 10 = 135 + 10 = 145°