Answer:
Each element is obtained by adding -10 to the previous term
Step-by-step explanation:
Sequence refers to a set of elements such that the elements are arranged according to some rule .
The number of elements in a sequence is called length of sequence .
A sequence can be finite or infinite .
Sequence is said to be finite if it has finite number of elements and said to be infinite if it has infinite number of elements .
Given sequence : 9,-1,-11,-21
We need to describe the relationship between the successive terms in the sequence .
Here, we can see the following relation between elements :
[tex]-1-9=-10\\-11-(-1)=-11+1=-10\\-21-(-11)=-21+11=-10[/tex]
So, each element is obtained by adding -10 to the previous term .
