Answer:
x = 4
Explanation:
P is the midpoint of line segment ST
This means that the segment ST can be divided into two equal segments, SP and PT.
We are given:
SP = PT = x + 4
ST = 4x
Solving the equation:
ST = SP + PT
4x = x + 4 + x + 4
4x = 2x + 8
4x - 2x = 8
2x = 8
x = 8/2
x = 4