Answer: 
$3027.80
Explanation: 
The compound interest formula is the following. 

where 
A = final amount 
P = principle amount 
r = interest rate / 100 
n = number of compounds per interval 
t = time interval 
Now in our case, 
A = unknown
P = $1900
r = 10.4/100
n = 12 months / year ( because the interest is compounded monthly) 
t = 4.5 yrs
Therefore, the compound interest formula gives 

Using a calculator, we evaluate the above to get 

which is our answer! 
 
        
             
        
        
        
Hun, nothing is attatched. Try to attach something or tell me the problem? I'll try and answer it..
Have a fantasic day/night!
 
        
                    
             
        
        
        
You will have to get the difference and get a common denominator but first combine the mixed number:

Then subtract the numbers

Angel took 5/12 hours longer than Chris
 
        
        
        
Answer:
A sample size of 35 is needed.
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 Ztable as such z has a pvalue of  .
.
So it is z with a pvalue of  , so
, so 
Now, find the width W as such

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.
How large must the sample size be if the width of the 95% interval for mu is to be 1.0:
We need to find n for which W = 1.
We have that  , then
, then  . So
. So





Rounding up
A sample size of 35 is needed.