Could be 21. Try replacing function designators with the actual functions.
        
             
        
        
        
Answer:
6
Step-by-step explanation:
 
        
             
        
        
        
x + 1/2 = 3/4
set denominators equal:
x + 2/4 = 3/4
-2/4 for both sides:
x = 1/4
there you go! hope this helps!
 
        
                    
             
        
        
        
Answer:
Yes
Step-by-step explanation:
There are 10 mm in 1 cm. 
We have 300 mm, so let's convert this to cm by using a proportion:
 , where x is the number of cm in 300 mm.
Cross-multiplying, we get: 10x = 300, so x = 30 cm.
Clearly, 30 cm > 3 cm, so yes, 300 mm is greater than 3 cm.
Hope this helps!
 
        
                    
             
        
        
        
A (verdadeiro) 
e(verdadeiro)