Answer:
5
Step-by-step explanation:
Write the question down I can't see that
Answer:

Step-by-step explanation:
AC = AB + BC



Add 7 to both sides:


Subtract 7x from both sides:

Divide both sides by 11:


Answer:
19
Step-by-step explanation:
20 - 8 = 12
12 + 5 = 17
17 - 7 = 10
10 + 9 = 19