Pi aka 3.14 is a very commonly know irrational number
        
                    
             
        
        
        
Answer:
39°
Step-by-step explanation:
51° +? = 90°
? = 90° - 51°
? = 39°
Hope it helps you in your learning process.
 
        
             
        
        
        
Answer:
7.20
Step-by-step explanation:
triangle is right triangle so other leg of first is 12
5 x 3/5 = 5, so
do 12 x 3/5 to get 7.20
 
        
             
        
        
        
The answer is -51, hope this helps
        
                    
             
        
        
        
The answer is 3, since 3*3*3 equals 27