Answer: Options 'C' and 'E' are correct.
Step-by-step explanation:
Since we have given that 
Quantity of snowfall in February at Delphine's house be f centimeters
Quantity of snowfall in March at Delphine's house be 40% more than in February.
According to question,

So, Options 'C' and 'E' are correct.
i.e. C) 1.4f
E) 
 
        
                    
             
        
        
        
Answer: We are using a line regression tool to solve the parameters asked in the problem. We can use online tools or that of Excel. According to the tool, the best fit values are 
Slope0.3848 ± 0.03956
Y-intercept0.6053 ± 0.6370
X-intercept-1.573
1/Slope2.598
Step-by-step explanation: Best fit lines make sure that the standard deviation at each point is minimum from the best fit line.
 
        
                    
             
        
        
        
It Will Be option A ok 2r -6'²
 
        
                    
             
        
        
        
So you basically plot a point of the y axis on 7 then since the slope is -3x you have to go down 3 and to the right 1 and keep going then you have to do the same but opposite, go up 3 times and to the left 1 unit.