To solve the exercise shown in the figure attached, you must apply the proccedure shown below: 1. You must apply the Tangent Secant Segment Theorem, as following: ST²=QTxRT 2. Now, solve for ST: ST=√(QTxRT) 3. Subtitute the values: ST=√(23+7)(7) ST=14.49 inches The anwers is: 14.49 inches.