Question

I have Ben working on this same question for about 10 minutes. I could really use some help please.

Answer 1

Answer:

b

Step-by-step explanation:

$a_{1}=4,\\a_{n}=\frac {1}{3} a^{n-1}\\r=\frac{a_{n}}{a_{n-1}} =\frac{1}{3}\\explicit~rule~is\\\\a_{n}=a_{1}r^{n-1}\\a_{n}=4(\frac{1}{3})^{n-1}$

Answer 2

Step-by-step explanation:

Every next term is 1/3 times of the previous term. The first term is 4.

Hence the rule is An = 4 * (1/3)^(n-1).