Answer:
Step-by-step explanation:
 
        
                    
             
        
        
        
 
Step-by-step explanation:
Since we have given that 
Time taken by steamboat makes the trip=5 hours
Time taken by yacht makes the trip =2.5 hours
Since we have also given that 
the yacht is 20 knots faster than the steamboat, 
So let the speed of steamboat be x
Let the speed of yacht be x+20
Now,  we have given that both boats will travel the same distance , 
So,

Hence, 

 
        
             
        
        
        
Answer:
Hey there!
(8^2)^-4=8^2(-4), or 8^-8
8^-8 can be expressed as the third option.
Hope this helps :)
 
        
             
        
        
        
X+y=8
2x^2-y=-5
elimination method means you link the 2 equations together to make one 
these two already have y in the perfect form where you can cancel it out +y and -y so no need to perform any other action to a certain equation.. all you need to do is add them now
2x^2+x=3