What is the 17th term of the arithmetic sequence 15, 19, 23, ... ?

Question

What is the 17th term of the arithmetic sequence 15, 19, 23, ... ?
Choose one answer.
A. 79
B. 83
C. 87
D. 91

Answer 1

a_n = a₁ + (n - 1)d, where a₁ = first term, n = number of terms, d = common difference

 

a₁₇ = 15 + (17 - 1)4

a₁₇ = 15 + (16)4

a₁₇ = 15 + 64

a₁₇ = 79