Question

What is the nth term of the sequence: 11 ,15, 18, 23, 27..

Answer 1

an = 11 + 4 (n-1)

Explanation:

for an arithmetic sequence

an =a1+d(n-1)

where n is the term number

a1 is the first term

and d is the common difference

a1 =11

d = 15-11 = 4

we are increasing by 4 each time

an = 11 + 4 (n-1)