Question

What is the rule for the nth term, an, when the first 4 terms of the sequence are 4, 16, 64, 256?
A.
an=(‒4)^n ‒ 1
B.
an=4n
C.
an=4^n ‒ 1
D.
an=4^n

Answer 1

4, 16, 64,  256

4¹, 4², 4³, 4⁴

Do you see the pattern?  $a_{n} = 4^{n}$

Answer: D