225k views
25 votes
Whats the ninth term of 25 20 15 10 5

User Ravyoli
by
7.9k points

1 Answer

7 votes

Given:

The sequence is 25, 20, 15, 10, 5.

To find:

The ninth term of the given sequence.

Solution:

We have,

25, 20, 15, 10, 5

It is an AP because the difference between two consecutive terms are same.

Here,

First term (a) = 25

Common difference (d) = 20-25

= -5

The nth terms of an AP is


a_n=a+(n-1)d

Where, a is the first term and d is the common difference.

Putting a=25, n=9 and d=-5 to get the 9th term.


a_9=25+(9-1)(-5)


a_9=25+(8)(-5)


a_9=25-40


a_9=-15

Therefore, the ninth term of the given sequence is -15.

User Matthew MacFarland
by
7.9k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories