Answer:
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We known that the figures are similar if and only if the corresponding sides and and angles have the common scale factor. In this item, the scale factor is 0.6. The length of AB is determined by multiplying the length of FG with the scale factor. That is,
                            AB = FG x scale factor
                            AB = (12 cm) x 0.6
                            AB = 7.2 cm
Thus, the length of side AB is 7.2 cm. 
        
                    
             
        
        
        
ANSWER
Approximately after 15 minutes.
EXPLANATION
The growth rate of the first bacteria is 

The growth rate of the first bacteria :

To find the time that, there will be an equal number of bacteria, we equate the two equation;



We solve for t to get,

Or

We discard the negative value.
This implies that,
