Answer:
See below 
Step-by-step explanation:

 
        
                    
             
        
        
        
This is an exponential growth problem. Exponential growth can be expressed mathematically in the following way: 

.
Parameter a presents initial amount.
Parameter r is percentage increase. 
Parameter t is time.
An equation that would describe given problem is:

t is the time in years.
I attached the graph of this function.
 
        
        
        
Answer: $24.19
Step-by-step explanation:
From the question, we are informed that Mai bought gas for her car which cost $2.95 per gallon and that she bought 8.2 gallons.
The total cost for Mai's gas will be:
= $2.95 × 8.2
= $24.19