Answer:
3x +19
Step-by-step explanation:
(9-6-4x+9)+(12+7x-5)
(12-4x)+(7+7x)
3x+19
 
        
             
        
        
        
Answer is C. Definitely not d right off the bat because both exponents are negative so cross that out. After that its just counting zeros.
        
                    
             
        
        
        
Answer:
t = 21d
Step-by-step explanation:
Here tension and distance are denoted t by d  and  respectively. Since  t varies directly with d , then the relation between  t and d is k=td Given that, for the tension 42 pounds, the spring is stretched 2 inches. Substituting  t = 42 and d= 2 into  t = kd find the value of k . Therefore,
42= K (2)

K= 21
Thus the relationship is t = 21d
(Hope this helps can I pls have brainlist (crown)☺️)
 
        
             
        
        
        
Answer:
20:15
Step-by-step explanation:
baiscally add 4:3 
4+3=7 
then take the total of 35 and divide it by 7 you'd get 5.
4x+3x=35 
7x=35
1x=5
4x=5×4=20
3x=5×3=15 
4:3 therefore would be 20:15
 
        
             
        
        
        
Answer:
the 3rd one
Step-by-step explanation: