Answer:
4x - 8
Step-by-step explanation:
... ∠RST = ∠RSQ + ∠QST
Since SQ bisects ∠RST, that means ...
... ∠RSQ = ∠QST
Using this fact in the first equation, we have
... ∠RST = ∠RSQ + ∠RSQ = 2×∠RSQ
Using the given expression for ∠RSQ, we have
... ∠RST = 2×(2x-4) = 4x - 8
