The first term of a arithmetic sequence is 640 and the 8th term is 493. What is the common difference in the sequence

asked Aug 12 in Algebra 1 Answers by Kathryn

Your answer

Your name to display (optional):
Privacy: Your email address will only be used for sending these notifications.
Anti-spam verification:
To avoid this verification in future, please log in or register.

1 Answer

The first term is usually represented by a, the next term is a+d and the nth term is a+(n-1)d.

So a=640 and the 8th term (n=8) is 493. So 493=640+7d and 7d=493-640=-147 therefore d=-147/7=-21.

answered Aug 12 by Rod Top Rated User (582,800 points)

Related questions

Welcome to MathHomeworkAnswers.org, where students, teachers and math enthusiasts can ask and answer any math question. Get help and answers to any math problem including algebra, trigonometry, geometry, calculus, trigonometry, fractions, solving expression, simplifying expressions and more. Get answers to math questions. Help is always 100% free!
81,658 questions
85,896 answers
2,190 comments
69,334 users