I believe  -7 + 91i. i hope this helps
 
        
             
        
        
        
Answer:
where's the question I'm confused 
 
        
             
        
        
        
Answer:
Don't fail
Step-by-step explanation:
 
        
             
        
        
        
Answer:
(1) 2π - x² = 0 (2) x = 2.5 cm (3) perimeter = 10 cm
Step-by-step explanation:
(1)The area of the circular coin without the inner square removed is πr² where r = 3 cm is the radius of the coin. So, the area of the coin without the inner square removed is πr² = π(3 cm)² = 9π cm²
The area of the square of x sides removed from its center is x².
The area A of the each face of the coin is thus A = 9π - x²
Since the area of each face of the coin A = 7π cm²,
then
7π = 9π - x²
9π - 7π - x² = 0
2π - x² = 0
(2) Solve the equation 2π - x² = 0
2π - x² = 0 
x² = 2π 
x = ±√(2π) 
x = ± 2.51 cm
Since x cannot be negative, we take the positive answer.
So, x = 2.51 cm 
≅ 2.5 cm 
(3) Find the perimeter of the square
The perimeter of the square, p is given by p = 4x
p = 4 × 2.51 cm
 = 10.04 cm 
≅ 10 cm
 
        
             
        
        
        
Answer:
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Step-by-step explanation:
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