Answer:
x = 5, ST = 45
Step-by-step explanation:
Given that m bisects SU, then
ST = TU , that is
9x = 4x + 25 ( subtract 4x from both sides )
5x = 25 ( divide both sides by 5 )
x = 5
Thus
ST = 9x = 9 × 5 = 45
