First I calculate in how many weeks Caroline will get 80$ 
4$*20 weeks =80$ 
but Caroline had 20$ at the beginning which means in 20 weeks she will have collected 80$+ 20$= 100$ 
the answer is after 20 weeks Caroline will have more than 100$in her bank .
        
                    
             
        
        
        
.00000146!!!!!!!!!!!!!!!!!!
        
                    
             
        
        
        
Answer:
The margin of error is of 0.01.
Step-by-step explanation:
We have that to find our  level, that is the subtraction of 1 by the confidence interval divided by 2. So:
 level, that is the subtraction of 1 by the confidence interval divided by 2. So:

Now, we have to find z in the Z-table as such z has a p-value of  .
.
That is z with a pvalue of  , so Z = 1.037.
, so Z = 1.037.
The margin of error is of:

In which  is the standard deviation of the population and n is the size of the sample.
 is the standard deviation of the population and n is the size of the sample.
Standard deviation was 0.21. 
This means that 
Sample of 450:
This means that 
What is the margin of error, assuming a 70% confidence level, to the nearest hundredth?



The margin of error is of 0.01.
 
        
             
        
        
        
You need to get x by itself. Add 6 to both sides.
x = 14