Find the formula for the nth term of the arithmetic sequence.  Use the formula to find the 20th term in the arithmetic sequence.

Calculus: Early Transcendentals
8th Edition
ISBN:9781285741550
Author:James Stewart
Publisher:James Stewart
Chapter1: Functions And Models
Section: Chapter Questions
Problem 1RCC: (a) What is a function? What are its domain and range? (b) What is the graph of a function? (c) How...
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Find the formula for the nth term of the arithmetic sequence.  Use the formula to find the 20th term in the arithmetic sequence.  1, 9, 17, 25

 

an

a20

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I don't understand the a20 answer?? Is that 2n-7??

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