Answer:
Algebraic expression ; 3x = 39
Step-by-step explanation:
Let the unknown number be x

Further solving

It’s a scam don’t click on it or do anything
Answer:
i’m pretty sure it’s because they make 180°
Step-by-step explanation:
Answer:
It's true.
Explanation:
2(segment ST) = RT
divide both sides by two
ST = RT/2
You would have two equal halves of RT. One half equals RS. The other half equals ST.
Here's a rough picture of the line.
R _____________S_____________ T
S is in the middle of the line which makes it the midpoint.
It's true. S is the midpoint of RT.