We are trying to find the number that when added to 19, gives us less than 42. We can set up this simple inequality:
19 + x < 42
Now, subtract 19 from both sides:
x < 23 
Our number can be anything less than 23.
        
                    
             
        
        
        
Answer:

Step-by-step explanation:
Given

 -- City C
 -- City C
 --- City K
 --- City K
Required
Determine the 90% confidence interval
This is calculated using:

Calculating 




For a 90% confidence level, the z-score is 1.65.  So:

Calculating the standard deviation 

So:


So:


 
        
             
        
        
        
Answer:
22 years old 
Step-by-step explanation:
 
        
             
        
        
        
The pattern is multiplying the top by two and multiplying the bottom by 3.
16*2/81*3
32/243
64/729
128/2189
if you need more you can just use a calculator
        
             
        
        
        
B) If the line is parallel, that means the slope is the same. 
    The slope for the original line is 

 = 

. 
    The second form of coral line would be y = -1/4x + (any number). You could          use 
y = -1/4x + 3.c) Solve 12x = 24 + 3y for y.
    3y = 12x - 24
    y = 4x - 8
    Perpendicular lines have negative reciprocal slopes... the negative reciprocal      for -1/4 is 4. So 
yes, the third coral structure is perpendicular to the first coral.