I think the answer might be c
 
        
             
        
        
        
Answer:
Following are the solution to this question:
Step-by-step explanation:
Using formula:

In question (1):

In point a:

In point b:

                  
In question (2):

In point a:

In point b:

                  
The 3 question is incomplete, that's why it can't be solved.
 
        
             
        
        
        
Answer:
If there are 5000 bacteria in a colony right now, there will be  5000x2, or 10000 bacteria in the colony in 37 minutes. 
If there are 10000 bacteria in the colony in 37 minutes, there will be 20000 bacteria in the colony in 74 minutes, as the bacteria doubles every 34 minutes.
Let me know if this helps!