Answer:
The given sequence 6, 7, 13, 20, ... is a recursive sequence
Step-by-step explanation:
As the given sequence is

- It cannot be an arithmetic sequence as the common difference between two consecutive terms in not constant.
As
 ,
,  
As d is not same. Hence, it cannot be an arithmetic sequence.
- It also cannot be a geometrical sequence and exponential sequence. 
It cannot be geometric sequence as the common ratio between two consecutive terms in not constant.
As
 ,
,   
 
 ,
,  
As r is not same, Hence, it cannot be a geometric sequence or exponential sequence. As exponential sequence and geometric sequence are basically the same thing.
So, if we carefully observe, we can determine that:
- The given sequence 6, 7, 13, 20, ... is a recursive sequence. 
Please have a close look that each term is being created by adding the preceding two terms.
For example, the sequence is generated by starting from 1.
      
and 
      
for n > 1.
<em>Keywords: sequence, arithmetic sequence, geometric sequence, exponential sequence</em>
<em>Learn more about sequence from brainly.com/question/10986621</em>
<em>#learnwithBrainly</em>
 
        
             
        
        
        
What you could do it is. Start adding numbers and once you get close to
6 numbers See if you are close to 51 and switch around the numbers to make it equal 51 hope this helps
        
             
        
        
        
Answer:
I got -0.09... 
although I could be wrong, don't take my word for it, it's been a while lol
 
        
             
        
        
        
Answer:
Step-by-step explanation: