The correct answers will be A. The ninth odd number. B.O(8) + 2 and D.17.
I did this too and those were the right answers!
I hope this helps! :>
        
             
        
        
        
Okay, first, given the equation, we need to find out what the radius of the circle is. Let us state the general equation of a circle: 

Where 

 is the centre of the circle. In this case, we don't need to know the centre. Just the radius. 
Let us start by converting the equation into standard for, which I typed above. Divide both sides by 81. 

Great! We now know the radius of the circle. It is 

 because it is the bottom fraction. Now we know that the radius is 9. 
So now lets input this into the area of circle formula: 
 
 Now we insert our radius. 
 
  
 You can convert that into a decimal if you wish. 
Hope this helped!
~Cam943, Moderator
 
        
        
        
Answer:
4 minutes and 32 seconds 
Step-by-step explanation:
card $20.00-money left over $15.68            $20.00-$15.68  4.32
 
        
             
        
        
        
Answer:
(11, 12)
Step-by-step explanation:
<u>Mid point coordinates:</u>
- x = (x₁ + x₂)/2
- y = (y₁ + y₂)/2
<u>Since midpoint and one endpoint given (10, 4) and (9, -4), the other endpoint:</u>
- x₂ = 2x - x₁ = 2*10 - 9 = 11
- y₂ = 2y - y₁ = 2*4 - (-4) = 12
<u>So the other endpoint is: </u>(11, 12)