Question

The first term of an arithmetic sequence is 4 and the fifth term is 16. what is the nth term of the sequence?

a. 4n
b. 3n 1
c. 5n ��� 1
d. 4n 1 please select the best answer from the choices provided a b c d

Answer 1

T1 = 4
4 = a

T5 = 16
16 = 4 + 4d
4d = 12
d = 3

Tn = 4 + ( n - 1 ) 3
Tn = 4 + 3n - 3
Tn = 3n + 1

the answer is b