A community for students. Sign up today!
Here's the question you clicked on:
 0 viewing
 2 years ago
The first term of an arithmetic series is 5 and the 22nd term is 68. Find the sum of the series
 2 years ago
The first term of an arithmetic series is 5 and the 22nd term is 68. Find the sum of the series

This Question is Closed

Yahoo!
 2 years ago
Best ResponseYou've already chosen the best response.0an = a + (n1)d use this

best.shakir
 2 years ago
Best ResponseYou've already chosen the best response.0The first term of an arithmetic series is 5 and the 22nd term is 68. Find the sum of the series. The 22nd term (68) is the sum of the first term (5) and 21 times the common difference, d. This gives us an equation to solve for d: 5 + 21d = 68 21d = 63 d = 3 Judging by the content of these questions, you should have been given a formula for the sum of n terms of a series with first term a and common difference d. It's an + dn(n1)/2 (although you might have a slightly differentlooking formula or one with different variables). Using known values a=5, n=22, d=3 we can find the sum 5*22 + 3*22*21/2 = 110 + 33*21 = 110 + 693 = 803

best.shakir
 2 years ago
Best ResponseYou've already chosen the best response.0@katiebugg did u get it?
Ask your own question
Ask a QuestionFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.