Answer:
6
Step-by-step explanation:
 
        
                    
             
        
        
        
Hello here is a solution : 
 
        
        
        
Answer:
the answer is 45 . so circle 4
 
        
                    
             
        
        
        
Answer:
2.0
Step-by-step explanation:
x = age
y = average systolic blood pressure
x₁ = 40 years old, y₁ = 110 systolic blood pressure
x₂ = 50 years old, y₂ = 130 systolic blood pressure

∴ Slope of the regression line is 2.0