Answer:
[tex]a_n=\,\boxed{11-4n}[/tex]
Step-by-step explanation:
The sequence has a common difference of 3-7 = -4 and a first term of 7. Using the explicit formula ...
an = a1 +d(n -1)
we can fill in those values to find ...
an = 7 -4(n -1)
an = 11 -4n