Answer:
25.
Step-by-step explanation:
I am assuming you only mean the small triangles, not the composite ones.
The  second  triangle set has 3 triangles on bottom row and 1 on the top - total 4.
 The 3rd triangle set has 5 triangles on the bottom , 3 on the next up and 1 on the top  - total  9
Following the pattern 4th set will have the number of triaNGLES
7 + 5 + 3 + 1 = 16.
So the 5th will have 9 + 7 + 5 + 3 +1 = 25 triangles.
 
        
             
        
        
        
Okay too answer this you have to take the two smallest numbers and add them, in this case the answer would be 5 + 4 = 9. The answer has to be greater than the last number, In this case, 7. So the answer is yes. 
 
        
             
        
        
        
22 - 14 = 8 
so i think j = 8
        
             
        
        
        
The answer is C. 3 3/4 is the answer.
 
        
             
        
        
        
Greg needs to bike 57 miles on the last day so that his average is 59 miles per day.