Answer:21
Step-by-step explanation:i did the math
 
        
             
        
        
        
Answer:
6
Step-by-step explanation:
Total number of subsets is given as 

But the subset of a set consists of the proper subsets, an empty set and the set itself. 
Total number of subsets are 64
Therefore,


Comparing both sides

 
        
             
        
        
        
Answer:
x² - 5x = 14
x = -2   or   x = 7
Step-by-step explanation:
x² - 5x = 14
x² - 5x - 14 = 0
(x+2)(x-7) = 0
x = -2   or   x = 7