Answer:
x=16
Step-by-step explanation:
(4x+2)+(x+8)=90
5x+10=90
5x=80
x=16
 
        
             
        
        
        
Answer:  It needs 2.4 hours to complete the trip.
Step-by-step explanation:
Since we have given that
Length of Oregon trail = 2.197 miles
Speed at which it travel = 20 miles per day
we need to find the time taken by it ,
As we know that 


So, 
it will be changed into hours 

so, it needs 2.4 hours to complete the trip.
 
        
             
        
        
        
The answer would be SSS or Side-Side-Side.