Question

Write an explicit formula for the sequence 9, 13, 17, 21, 25 then find a14. Thank you.

Answer 1

Note that all the terms increase by 4This is arithmetic sequence with first term 9 and common difference 4

Nth term = 9 + 4(n-1)
= 4n+5 answer

Term a14 = 4(14) + 5 = 61 Answer