Answer: 21.3 
Step-by-step explanation:
63.9 divided by 3 equal pieces is 21.3!
 
        
             
        
        
        
First subtract the 7 from both sides and that would equal 2x+9=2x then subtract 2x and the answer is 9
        
                    
             
        
        
        
Answer:
c!!
Step-by-step explanation:
last saturday i did a worksheet that had the sae question
 
        
                    
             
        
        
        
I don't know if this is just my phone, but the picture won't load. 
You could try posting a new picture? Or feel free to message me with the picture and I'll be glad to help! :)
        
                    
             
        
        
        
Answer:
Factor by which kinetic energy increase = 4 times
Step-by-step explanation:
Given,
- Mass of the car, v1 = 1500 kg
- initial speed of car = 35 miles/h
                                
                                = 15.64 m/s
Initial kinetic energy of the car is given by,

        
        = 183606.46 J
- Final velocity of car v2 = 70 miles/hour
                                       
                                       = 31.29 m/s
So, final kinetic energy of car is given by

         
         = 734425.84 J
Now, the ratio of final to initial kinetic energy can be given by,

 
                      
Hence, the kinetic energy will increase by 4 times.