Answer:
x = 3
Explanation:
"AC" is the segment from point A to point C. From point A to point B is 3x + 7, and from point B to point C is 2x.
To solve, you'd add the known segment values from point A to point C to create an equation -->
AC = (x + 7) + (2x) = 3x + 7,
Since you know that AC = 16, you now js have to set 3x + 7 equal to 16 and solve -->
3x + 7 = 16, subtract 7 from both sides
-7 -7
3x = 9, divide both sides by 3
/3 3
x = 3