Question

Hey can someone help me with this question?
What are the explicit equation and domain for an arithmetic sequence with a first term of 5 and a second term of 3?

Answer 1

a1=5 and a2=3 then d=3-5=-2
a2=a1+d
a3=a2+d and so on
then AP is 5,3,1,-1,-3...............

Answer 2

here are my answer choices
an = 5 − 3(n − 1); all integers where n ≥ 1
an = 5 − 3(n − 1); all integers where n ≥ 0
an = 5 − 2(n − 1); all integers where n ≥ 0
an = 5 − 2(n − 1); all integers where n ≥ 1
Not sure how to find the right equation

Answer 3

an=a1+(n-1)*d
=5+(n-1)*(-2)
=5-2(n-1),n>=1

Answer 4

a1 is first term and a2 is second term and d is common difference =a2-a1
and formula an= a1+(n-1)*d put values.

Answer 5

start n=1 since n=0 not give a1=5

Answer 6

fine

Answer 7

I see, thank you so much for your help