Answer:
The answer to your question is: AC = 36
Explanation:
Data
AC is the total length
B is the midpoint
AC = 5x - 9
AB = 2x
AC = ?
Process
AC is the total length and B is the midpoint, so, AB is half the length of AC
So, 2AB = AC
2(2x) = 5x - 9
Solve for x 4x = 5x - 9
4x - 5x = -9
-1x = -9
x = -9 / -1
x = 9
Finally
AC = 5x - 9
AC = 5(9) -9
= 45 - 9
= 36