Answer:
190
Step-by-step explanation:
Data provided in the question:
Confidence level = 99%
Therefore,
α = 1% = 0.01
[ from standard normal table ]
z-value for  = 2.58
 = 2.58 
Margin of error, E = $0.06
Standard deviation, σ = $0.32
Now,
n = 
Here,
n is the sample size (or the minimum number of gas stations  )
on substituting the respective values, we get
=  
 
=  
 
= 13.76²
= 189.3376 ≈ 190
Hence,
minimum number of gas stations that she should include in her sample is 190
 
        
             
        
        
        
I don’t not know the answer for this question sorry
 
        
                    
             
        
        
        
You’re answer would be x=7
 
        
                    
             
        
        
        
So now its

but you want it in y=mx+b so 
add x to both sides so that you have y on its own 
so now it's 
 
 
        
        
        
Slope:  rise over run, for any straight line.  Example:  y=mx + b
Constant of proportionality:  a constant by which you multiply your independent variable (x) to get a specific value of the dependent variable (y).  Example: y=kx.
The main difference here is that y=mx+b may or may not pass through the origin, whereas y=kx always passes through the origin.
Both k and m are "slopes," with k pertaining to direct variation y=kx, and m pertaining to slope of a line which may or may not pass through the origin.
In this limited sense, both k and x are slopes.  k could be the slope of a straight line passing thru the origin, same as m, but m could not be the constant of proportionality if the line in question does not pass through the origin.