Answer:
SM = 13
Step-by-step explanation:
M is the midpoint of ST, then
SM = MT , that is
2x + 3 = 4x - 7 ( subtract 4x from both sides )
- 2x + 3 = - 7 ( subtract 3 from both sides )
- 2x = - 10 ( divide both sides by - 2 )
x = 5
Then
SM = 2x + 3 = 2(5) + 3 = 10 + 3 = 13
