We need the half-life of C-14 which is 5,730 years.
Now, we will need a half-life equation:
elapsed time = half-life * log (bgng amt / ending amt) / log 2
We'll say beginning amount = 100 and ending amount = 41
elapsed time = 5,730 * log (100/41) / log 2
elapsed time = 5,730 * log (
<span>
<span>
<span>
2.4390243902
</span>
</span>
</span>
) / 0.30102999566
elapsed time = 5,730 * 0.38721614327 / 0.30102999566
elapsed time =
<span>
<span>
</span></span><span><span><span>5,730 * 1.2863041851
</span>
</span>
</span>
<span>elapsed time = 7,370.523 years
Source:
http://www.1728.org/halflife.htm </span>
        
             
        
        
        
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! 
 
        
             
        
        
        
Answer:
i got 485! 
Step-by-step explanation:
multiply 40 by $15 = 600 then subtract 10% = 540 then subtract 7.5% = 499.5 lastly subtract 2.9% = 485 and that's his take home money :)
 
        
             
        
        
        
2,160 / 36
= 60
Therefore, the average distance that the bus travels in one hour is 60 miles
        
             
        
        
        
Answer:
4.25
Step-by-step explanation:
4.20<4.25