Answer:
x/x+3 
Step-by-step explanation:
first off, we start by factorizing. 
we start with the numerator  taking x out making it x (x-3) / x^2 - 9
then we factorize the denominator a bit more...making it x (x-3) /  (x-3) (x+3)
as you can tell there is a (x-3) on both sides. so we can cross them out. 
x/x+3 is left. try it yourself again so you can understand other questions like this! I hope I could help!
 
        
             
        
        
        
The answer would be number three because the slope is going towards the bottom of the graph
        
                    
             
        
        
        
Answer:
It takes the Dolphin 2 hours for swimming 40 miles. The penguin takes 8 hours and the swordfish will take 2/3 of an hour, which is 40 minutes to travel 40 miles.
Step-by-step explanation:
Given :
The bottlenose dolphin travels 40 miles in 2 hours. Or it takes 20 miles in 1 hour. 
Now, dividing the distance by unit rate given in the question:
40/20=2 hours
40/5=8 hours
40÷60= 2/3 hour 
Therefore, 
- the dolphin takes 2 hours for swimming 40 miles.
- the penguin takes 8 hours
- the swordfish takes 2/3 rd of an hour