Question

can someone help me with number 25

Answer 1

Sure.
The rule says that "The 'n'th term is  2^n + 1. "

You're asked to find the 5th term, so plug '5' into the rule in place of 'n'.

The 5th term = 2^5 + 1

2^5 = 2 x 2 x 2 x 2 x 2 = 32

The 5th term = 32 + 1 = 33 .