Answer:
 i think the 2nd one is correct .. i have not fluent in english to explain the answer. 
 
        
             
        
        
        
Answer:
105°
Step-by-step explanation:
180 minus 75 from angle 6 would give you angle 3. 
 
        
             
        
        
        
The answer should be 31, if I’m doing this correctly. 
6(3)2-5 (multiply 6 and 3, you get 18)
18(2)-5 (multiply 18 and 2, you get 36)
36-5 (subtract 36 and 5)
31
        
                    
             
        
        
        
10cm is the same as point 1 meter so 1.6 minus point 1 is 1.5
i hope this hp u