Answer:
AC, AB, BC
Step-by-step explanation:
Given

Required
Name the sides
(a)
and 
This represents side 
(b)
and 
This represents side 
(c)
and 
This represents side 
<em>i.e. we simply bring the name of both angles together</em>
Your answer is 138 which is correct
The answer is 3/4ths. If you have any questions please ask
Answer:
since equation 1 says that X= 1
any other equation saying x=1 will be valid!
Equation A
Equation B
Equation C
Equation D
all correct