Answer:
 (First step for obtaining a common denominator for the two fraction)
  (First step for obtaining a common denominator for the two fraction)

Step-by-step explanation:

where, 
a is acceleration of an object.(Need to calculate)




 
Now we will simplify above expression for a 
First we make common denominator. 
Common denominator is 7. So, we make both denominator 7. We multiply by 7 at top and bottom with 3. We get 
 (First step for obtaining a common denominator for the two fraction)
  (First step for obtaining a common denominator for the two fraction)
Now we combine the numerator 


 
        
                    
             
        
        
        
Answer:
D
Step-by-step explanation:
x²-4x-12≤0
x²-6x+2x-12≤0
x(x-6)+2(x-6)≤0
(x-6)(x+2)≤0
x=6,-2
∴ value of x lies between -2 & 6
 
        
             
        
        
        
Given that ∠B ≅ ∠C.
to prove that the sides AB = AC
This can be done by the method of contradiction.  
If possible let AB  =AC
=AC
Then either AB>AC or AB<AC
Case i:  If AB>AC, then by triangle axiom, Angle C > angle B.
But since angle C = angle B, we get AB cannot be greater than AC
Case ii:  If AB<AC, then by triangle axiom, Angle C < angle B.
But since angle C = angle B, we get AB cannot be less than AC
Conclusion:
Since AB cannot be greater than AC nor less than AC, we have only one possibility. that is AB =AC
Hence if angle B = angle C it follows that 
 AB = AC, and AB ≅ AC.
 
        
                    
             
        
        
        
Answer:
I got zero but I am not sure if that is right
Step-by-step explanation: