Define whether sequence is arithmetic or geometric and

nomadzkia0re

nomadzkia0re

Answered question

2022-03-25

Define whether sequence is arithmetic or geometric and write the n-th term formula
1) 5,8,11,
2) 5,20,80,

Answer & Explanation

paganizaxpo3

paganizaxpo3

Beginner2022-03-26Added 8 answers

(1) Given 5,8,11,
First tern a=5
Now, 118=85
Common difference d=3
Thus, the sequence is arithmetic
And the n-th term formula:
an=a+(n1)d
an=5+(n1)3
an=3n+2
Lana Hamilton

Lana Hamilton

Beginner2022-03-27Added 12 answers

2) 5,20,80,
First term is a=5
Common ratio is 8020=4 and 205=4. Thus, r=4
The sequence is geometric
n-th term:
an=a×rn1
=5×4n1
an=5×4n1

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