Answer:
-0.4 or 2.3
Step-by-step explanation:
simple
each box is 0.1 unit
 
        
                    
             
        
        
        
P=4πlr²
r²=P/4πl
r=√(P/4πl)= 1/2*(√(P/πl)
Answer is A
        
             
        
        
        
Answer:
8x - 11
Step-by-step explanation:
 ?
just do the multiplications and add things up. 
1 + 4(2x - 3) = 1 + 8x -12 = 8x - 11