Answer:
49.6cm
Step-by-step explanation: First you have to find the diameter of the circle by multiplying the radius by 2. 
8x2=16 
Then multiply 16 by 3.1
16x3.1=49.6
 
        
             
        
        
        
Answer:
4) 81/16
Step-by-step explanation:
Just solve the equation,
{3^2.5^0/4}^2
(9×1/4)^2
(81/16)
Hope it helps!
 
        
                    
             
        
        
        
(5b+xyz_6) xyx+ That is the right answe Im super positive it may seem wrong bit I got. you...
        
             
        
        
        
Answer:
 <em>( - 36, 24 ) </em>
Step-by-step explanation:
(- 9, 6) ------> ( - 9×4, 6×4) = <em>( - 36, 24 )</em> 
 
        
             
        
        
        
This is how you do it.
y = a(x - 3)(x - 8) 
<span>-2 = a(-1 - 3)(-1 - 8) </span>
<span>-2 = 36a </span>
<span>- 1 / 18 = a </span>
<span>y = ( - 1 / 18)(x^2 - 11x + 24) </span>
<span>y = (- 1 / 18)x^2 + (11 / 18)x - (3 / 2)
</span>
If this doesn't explain it enough, please, ask questions.