Answer:
-0.28
Step-by-step explanation:
 
        
             
        
        
        
Circular pen means you are going to use Area = Pi(r^2). 
So 78.5 = pi(r^2). Divide by pi on both sides to get r^2 = 78.5/pi. Take the square root of that to get r or radius = approximately 4.99. If you need an exact answer then use 

 for the next part because you are not done yet.
Plug whatever R you use into the circumference formula of Circumference = 2(pi)(r). 
If you use 4.99, you do 2(pi)(4.99) which is approximately 31.35. If you use the exact answer, you do 2(pi)(

) which gives you approximately 31.41. 
Either way you'll need about 31 meters of chicken wire but the 31.40796 or ~31.41 is closer to the exact answer. 
 
        
        
        
Answer:
p = - 5i or p = 5i
Step-by-step explanation:
Noting  = i
 = i
Given
p² = - 25 ( take the square root of both sides )
p = ±  = ±
 = ±  = ± 5i
 = ± 5i
Thus 
p = - 5i or p = 5i
 
        
                    
             
        
        
        
There is no restriction upon the domain, the x values, and is all real numbers or (-oo,+oo)
From such it is clear that the domain also contains all real numbers.
The range of f(x) is (-oo,+oo)
        
             
        
        
        
Answer:
2 1/6
Step-by-step explanation: