1. ## Arithmetic Sequences

Hi, I have 2 problems I do not understand; could anyone explain what exactly is meant by u1 and d? and how to solve for the said variables?
Thanks!

1-A sequence is defined by
Un=(71-7n)/2
Find U1 and d.

Another problem, if you can explain one, I'm sure I can understand the other one.

2- A sequence is defined by Un=3n-2
Find u1 and d.

Oh, and when I wrote Un and U1, I meant U with a subscript of n, and U with a subscript of 1. Sorry, I don't know how to make the subscripts appear.

2. (1.) u1 = (71 - 7(1))/2 = 32
u2 = (71 - 7(2))/2 = 28.5
u3 = (71 - 7(3))/2 = 25

d = 25 - 28.5 = -3.5
d = 28.5 - 32 = -3.5

(2.) Use the same procedure as in #1.

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### a sequence is defined by un=3n-2

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