What are the explicit equation and domain for an arithmetic sequence with a first term of 7 and a second term of 3?

an=a1+d(n-1)

a1=first term

d=common difference

n=which term

a1=7

a2=3

a2=3=7+d(2-1)

3=7+d(1)

3=7+d

-4=d

an=7-4(n-1)

expanded

an=7-4n+4

an=11-4n

domain is the numbers you can use for n (1,2,3,4,...)

the range is the output or the numbers you get in the sequence (7,3,-1,-5,...)

for the domain, we have to use numbers like 1,2,3,4,5

no 0

so we use natural numbers, that is the domain

fist on the left goes with the third on the right. second on the left goes with the fourth on the right. third on the left goes with the second on the right. the fourth on the left goes with first on the right