X^2-10x+16= 0
(x-8)(x-2)=0
x = 8 or 2
        
                    
             
        
        
        
Answer: according to spark notes: There can be 0, 1, or 2 solutions to a quadratic equation, depending on whether the expression inside the square root sign, (b2 - 4ac), is positive, negative, or zero. This expression has a special name: the discriminant.
In this case it is 0, not 2, which was my first and wrong answer
 
        
                    
             
        
        
        
Answer: 10 units²
Step-by-step explanation:
We can divide the shape along the y-axis to get 2 separate triangles. If we find the area of each and add them up, we can get the total area of the figure. 
We can get each triangle's area using the formula 
<h3>Left Triangle</h3>
base length - 4 units
height - 4 units


 
<h3>Right Triangle</h3>
base length - 2 units
height - 2 units



Total = 8 units² + 2 units² = 10 units²
 
        
             
        
        
        
Answer: 90 + 4, third choice   and    90 - -4, last choice
Her score is obviously higher when the mistake is fixed, adding the 4 points gives 94.