Answer:
explicit formula is 21 - 5n .
Step-by-step explanation:
Given : sequence 21, 16, 11, 6,...
To find : Write an explicit formula definition
Solution : We have sequence 21, 16, 11, 6,...
We can see from given sequence First term is 21 and difference = 5
Then , 21 - 5n
Let , n = 0
First term = 21 - 5 (0)
= 21
Second term , n = 1
Second term = 21 - 5 (1)
= 21 - 5 = 16
Third term , n = 2
21 - 5 (2)
21 - 10 = 11
Therefore, explicit formula is 21 - 5n .
