Answer:
10
Step-by-step explanation:
To find the slope subtract the points like the following:
(-27-(-7)/(-2-0)
= -20/-2
=10
So, the slope is 10.
 
        
             
        
        
        
Answer:
The  90 % confidence  interval  for the mean population is (11.176  ; 20.824 )
Rounding to at least two decimal places would give 11.18 , 20.83 
Step-by-step explanation:
Mean = x`= 16 miles per hour
standard deviation =s= 4.1 miles per hour
n= 4
 =  4.1/√4= 4.1/2= 2.05
  =  4.1/√4= 4.1/2= 2.05
1-α= 0.9
degrees of freedom =n-1=  df= 3
∈ ( estimator  t with 90 % and df= 3 from t - table ) 2.353
 Using Students' t - test 
x`±∈ * 
Putting values 
16 ± 2.353 * 2.05
= 16 + 4.82365
20.824  ;        11.176
The  90 % confidence  interval  for the mean population is (11.176  ; 20.824 ) 
Rounding to at least two decimal places would give 11.18 , 20.83
 
        
                    
             
        
        
        
-14a-5=-12
 +5 +5
-14a=-7
Divide -7 by -14a
a=2
        
             
        
        
        
Y2-y1/x2-x1
1-4/2-3
Slope is: -3/-1 or 3