Answer:
parentheses
exponents
multiplication/division
addition/subtraction
Step-by-step explanation:
PEMDAS
 
        
             
        
        
        
Answer:
 2 ; 10
Step-by-step explanation:
a + B = 12
a - B = 8
a = 12 - B
(12 - B) - B = 8
a = 12 - B
12 - 2B = 8
B = 2
A = 10
 
        
             
        
        
        
1. 112 degrees 
2. 68 degrees