I saw the image. QRST is a rectangle.
It has 4 right angles or 90° angles. ∠QRS ∠RST ∠STQ ∠TQR
Based on the image: ∠TQS and ∠RQS are complementary angles. This means that the sum of their angles is 90°
∠TQS is 24°. Thus, ∠RQS is 66°
90° - 24° = 66°
∠TQS + ∠RQS = 90°