Hello,
Angles y and 3y+8 are supplementaries since the quadrilater is inscribed
y+3y+8=180
==>4y=172
==>y=43 (°)
112.5 I believe is the right answer
God loves all of you, remember that oK. Thts really all u need in life <3 7 if u know answer in comments - 8400(3)2t= H is
Sin∠R = ST/RS ⇒ ST = RS * sin40° = 9 * 0.6428 ≈ 5.8