Pi is actually one of the letters of the Greek alphabet, but it is most known in the math field as the ratio between the circumference of a circle and the circle's diameter. 
There is no exact measure of pi, as it does not terminate but it starts like:
3.14159265
 
        
                    
             
        
        
        
Answer:
w=5
Step-by-step explanation:
using the distributive property to simplify the equation 
-4(w)+1(-4)=-24 so
-4w-4=-24 (adding 4 to both sides)
-4w==20 (divide by -4)
w=5
 
        
                    
             
        
        
        
Answer: 25
Step-by-step explanation:     (x-a)² = x² - 2ax + a²
   From x² - 10x + k  we deduce that 10x = 2·5x  and a = 5
Then k = 5²2
 
        
             
        
        
        
 F(−2)=14. Explanation: substitute x=− 2 into f(x). f(−2)=(3×(−2)2)−(−2). ××=(3×4)+2=12+2=14 .
        
                    
             
        
        
        
Answer:
x = 26
Step-by-step explanation:
The sum of the angles around point O = 360°, thus
x + 3x + 256 = 360 , that is
4x + 256 = 360 ( subtract 256 from both sides )
4x = 104 ( divide both sides by 4 )
x = 26