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

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter7: Exponents And Exponential Functions
Section7.9: Geometric Sequences As Exponential Functions
Problem 3GP
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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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