Maybe if i add 10 + 30 is = 40 this is my answer
        
             
        
        
        
Answer:
Answer: a5 = 2500
Step-by-step explanation:
For a geometric sequence:  
First term = a0  
Second term = a1 = a0*r  
Third term = a2 = a0*r^2  
Fourth term = a3 = a0*r^3  
....  
nth term = a(n-1) = a0*r^(n-1)  
Given: a1 = 4 = a0*r  
Also: r = 5  
So, a0*5 = 4 => a0 = (4/5)  
a5 = a(6-1) = Sixth term = a0*r^5 = (4/5)*5^5 = 2500  
Hope this helps 
correct me if im wrong☺
 
        
             
        
        
        
You can buy 5 bottles because $4 times 5 equals $20. I hope this helps :)
        
                    
             
        
        
        
Answer: THe Second answer is the correct one 
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
Step-by-step explanation:
let the speed of one plane=x
speed of other plane=x+80
time=4 hrs
then 4x+4(x+80)=3800
4x+4x+320=3800
8x=3800-320
or 8x=3480
x=435
speed of one plane=435 m/h
speed of other plane=435+80=515 m/h
2.
Let he walks x hrs 
then he take a taxi for 2-x hrs
4x+(2-x)50=31
4x+100-50x=31
-46x=-69 

so he walks 3/2 hrs=1.5 hrs
travels by taxi=2-1.5=0.5 hrs
distance traveled by taxi=0.5×50=25 miles