Answer:
ST = 62
Step-by-step explanation:
To solve this:
SM = MT (this is because M is the midpoint, meaning both SM and MT are the same length)
Substitute:
2x + 17 = 5x - 4
Solve:
17 = 3x - 4
21 = 3x
x = 7
Then, Substitute again to find the length of one side:
SM = 2x + 17
2(7) + 17
14 + 17
31
Multiply by 2, to find ST:
31 * 2 = 62
