PLEASE PLEASE PLEASE HELP I NEED IT What is the sum of the series?

QAmmunity.org

My account
Edit my Profile
Private messages
My favorites

Ask a Question
Questions
Unanswered
Tags
Categories
Ask a Question

asked Sep 4, 2019 78.3k views

3 votes

PLEASE PLEASE PLEASE HELP I NEED IT

What is the sum of the series?

Mathematics
college

Melia asked

by Melia

5.6k points

0 Comments

Please log in or register to add a comment.

Please log in or register to answer this question.

1 Answer

4 votes

Formula :

$n\left(a_1+(d\left(n-1\right))/(2)\right)$

Plug in the values :

$20\left(1+(-3\left(20-1\right))/(2)\right) = 550$

----------------------------------
Answer:550
----------------------------------

Rodrigo Lopetegui answered Sep 10, 2019

by Rodrigo Lopetegui

6.4k points

0 Comments

Please log in or register to add a comment.

Ask a Question

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

6.5m questions

8.7m answers

0 Comments

Please log in or register to add a comment.

Please log in or register to answer this question.

1 Answer

0 Comments

Please log in or register to add a comment.

Other Questions