Answer: 80
Step-by-step explanation:
 
        
             
        
        
        
Step-by-step explanation:
3 and 4. 
because the sum of the smaller two sides of a triangle have to be less than or equal to the 3rd larger side.
 
        
                    
             
        
        
        
1/6* (15a+20b)
= 1/6* 15a + 1/6* 20b (Distributive property)
= 2.5a + 10/3*b
The final answer is 2.5a+ 10/3b
Hope this helps~
        
             
        
        
        
Answer:
50 dgrees
Step-by-step explanation:
staruight line is 180 so 180 minus 130 is 50