Answer :

we get the length of AC as 14 units.

We are given that the length of AB = 4.

We are also given the expressions:

AC = x and BC = 2 x - 18

We need to find the value of AC

We know that:

AB + BC = AC

Substituting he values, we get that:

4 + 2 x - 18 = x

2 x - 14 = x

2 x - x = 14

x = 14

So, we get that,

AC = x

AC = 14 units.

Therefore, we get the length of AC as 14 units.

Learn more about expression here:

https://brainly.com/question/22048677

#SPJ9