If the first term of an arithmetic sequence is 4 and the third term is 18, what is the 23rd term?

A. 92

B. 116

C. 158

D. 161

C. 158

1. term 2. term 3. term 4. term 5. term

4 4 + d 18=4+d+d 18 + d 18 + d + d

14=2d

7=d

The equation: 4 + 7 (k - 1)

First term: 4 = 4 + 7 (1 - 1) = 4

Third term: 18 = 4 + 7 (3 - 1) = 18

23. term: 4 + 7. (23 - 1) = 4 + 7.22 = 158