Abstraction in mathematics is the process of extracting the underlying structures, patterns or properties of a mathematical concept, removing any dependence on real world objects with which it might originally have been connected, and generalizing it so that it has wider applications or matching among other abstract
        
             
        
        
        
Attached the solution and work.
 
        
        
        
Answer:
B. y= -3x2 + 3
Step-by-step explanation:
y= -3^2+3
 
        
             
        
        
        
Answer:
since -3.73 is less than 1.645, we reject H₀.    
Therefore this indicate that the proposed warranty should be modified 
Step-by-step explanation:
Given that the data in the question;
p" = 13/20 = 0.65
Now  the test hypothesis;
H₀ : p = 0.9
Hₐ : p < 0.9
Now lets determine the test statistic;
Z = (p" - p ) / √[p×(1-p)/n]
= (0.65 - 0.9) /√[0.9 × (1 - 0.9) / 20]  
= -0.25 / √[0.9 × 0.1 / 20 ]
= -0.25 / √0.0045
= -0.25 / 0.067
= - 3.73
Now given that a = 0.05, 
the critical value is Z(0.05) = 1.645 (form standard normal table)
Now since -3.73 is less than 1.645, we reject H₀.    
Therefore this indicate that the proposed warranty should be modified