Answer:
y = 125°
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 interior angles and equate to 540°
y + 86° + 142° + 72° + 115° = 540°
y + 415° = 540° ( subtract 415° from both sides )
y = 125°