Hello : 
f(12) represent : <span>B. The value of (7x − 1) when x = 12</span>
        
                    
             
        
        
        
Answer:
   100 J
Step-by-step explanation:
Kinetic energy is jointly proportional to mass and the square of the velocity.
   KE = 1/2mv²
   KE = 1/2(50 kg)(2 m/s)² = 100 J
Juan has a kinetic energy of 100 joules.
 
        
             
        
        
        
Answer:
you got the answer right it's 49
 
        
                    
             
        
        
        
Answer:
x = 34
Step-by-step explanation:
If it is bisected, that means the angles are equal <ABD = < CBD
The triangles are equal by SAS 
That means AD = CD
2x+30 = 3x-4
subtract 2x from each side
2x+30 -2x = 3x-4 -2x
30 = x-4
Add 4 to each side
3x+4 = x-4+4
34 =x