The mean absolute deviation of the data set is 4
        
             
        
        
        
<u>Answer:
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The population of a city has decreased by 38% since it was last measured. If the current population is 27,900 .Previous population of city was 45000.
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Solution:
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Given that current population of city is 27900.  
Also, population of a city has decreased by 38% since it was last measured.
Let assume that population of city when it was last measured = x
Decreased of 38% means x-38% of x . we can write this as,



So current population is 
Equating above expression to the given value of current population, we get


x=45000
Hence previous population of city was 45000.
 
        
             
        
        
        
Answer:
What is the number?
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:

Step-by-step explanation:
Hi there!
Slope-intercept form:  where <em>m</em> is the slope and <em>b</em> is the y-intercept (the value of y when x is 0)
 where <em>m</em> is the slope and <em>b</em> is the y-intercept (the value of y when x is 0)
<u>1) Plug in the slope (</u><u><em>m</em></u><u>)</u>
We're given that the slope is  . In
. In  , replace <em>m</em> with
, replace <em>m</em> with  :
:

<u>2) Determine the y-intercept (</u><u><em>b</em></u><u>)</u>

We're given the point (-9,4). Plug this point into the equation as  and solve for <em>b</em>:
 and solve for <em>b</em>:

Subtract  from both sides to isolate <em>b</em>:
 from both sides to isolate <em>b</em>:

Therefore, the y-intercept is  . Plug this back into
. Plug this back into  as <em>b</em>:
 as <em>b</em>:

I hope this helps!