Answer:
(b) an = 13 +(n -1)6
Step-by-step explanation:
The first term is a1 = 13, eliminating the 1st and 3rd choices.
The common difference is d = 19 -13 = 6. The multiplier of the common difference is (n -1), eliminating the 4th choice.
The correct choice is the 2nd choice:
[tex]a_n=13+(n-1)6[/tex]
