What is the explicit rule for this geometric sequence? 4,4/5,4/25,4/125,…
a)an=15⋅4n
b)an=4⋅(15)n
c)an=15⋅4n−1
d)an=4⋅(15)n−1

So for the formula of geometric sequence is:

An = ar^(n-1)

Where an is the nth number

a is the first term

r is the common ratio

n is the number of terms

since a = 4

r = (4/5)/4 = 1/5

an = 4(1/5)^(n-1)

if the syntax of the choices are correct the answer maybe D

18a

step-by-step explanation:

simply because it is. it's the highest common factor

answer: 15

step-by-step explanation: