Answer:
There will be 50 bacteria remaining after 28 minutes.
Step-by-step explanation:
The exponential decay equation is

N= Number of bacteria after t minutes.
 = Initial number of bacteria when t=0.
 = Initial number of bacteria when t=0.
r= Rate of decay per minute
t= time is in minute.
The sample begins with 500 bacteria and after 11 minutes there are 200 bacteria.
N=200
 = 500
 = 500
t=11 minutes
r=?



Taking ln both sides



To find the time when there will be 50 bacteria remaining, we plug N=50,  = 500 and
= 500 and   in exponential decay equation.
 in exponential decay equation.


Taking ln both sides




 minutes
 minutes
There will be 50 bacteria remaining after 28 minutes.
 
        
             
        
        
        
Answer:
100
Step-by-step explanation:
 
        
             
        
        
        
Answer:
The answer should be A, I think.
 
        
             
        
        
        
Answer:
b
Step-by-step explanation:
 
        
             
        
        
        
2+3=5
25/5=5
5x2=10 3x5=15
so the answer is:
£10:£15