ANSWER

EXPLANATION
If f(x) is continuous at 

Then,

The given function is 





Since,

The function is continuous at 

 
        
                    
             
        
        
        
Answer:
C.
Step-by-step explanation:
5z - 7, you would say 5 times z minus 7, which is the same as 5 less than th product of 7 and a number z
 
        
             
        
        
        
Answer:
y² = x² - z²
Step-by-step explanation:
x² - y² = z²
Transpose y the other side
x² - z² = y² 
or
 y² = x² - z²
 
        
                    
             
        
        
        
Answer:
x > 3
Step-by-step explanation:
This is based on the concept 'when a negative number is multiplied to both sides of the inequality, the sign gets reversed. For example, x > - 2 when it is multiplied by - 1, it becomes - x < 2.'
*only when the number is -ve. 
Similarly, in this question, multiply both sides by - 1. 
2x > 6 
x > 6/2
x > 3
For more : take - 5 > - 2, as you know
Note that 5 is actually greater than 2. To make this true we change signs