Question

What are first two terms of the sequence? What is the twelfith term? A(n)=2n+3

Answer 1

You need to know what n equals.

Answer 2

^^

Answer 3

http://www.khanacademy.org/math/precalculus/seq_induction/seq_and_series/v/finding-the-100th-term-in-a-sequence

If you still have questions, this vid might help.(:

Answer 4

First term is A(1). So plug in n = 1 and evaluate. The same applies for n = 2 and onward.