Asked by Miranda Lambert

4. Which explains why the sequence 81, 3, 1/9,... is arithmetic or geometric?
A)The sequence is arithmetic because it decreases by a factor of 1/27
B)The sequence is geometric because it decreases by a factor of 1/27
C)The sequence is arithmetic because it decreases by a factor of 3.
D)The sequence is geometric because it decreases by the factor of 3.
Answered by bobpursley
81*(1/27)^n

what is that for n=1?
for n=2?
Answered by Miranda Lambert
is it A?
Answered by bobpursley
no. what form is Ao* r^n ? You need to know that.
Answered by Justin Bieber
then its B
Answered by Justin Bieber
I guess it D Miranda
Answered by #Nataly G
how about this, can someone actually be sure on one answer!?! I mean "I guess", doesn't mean that you are sure about it. I have been stuck on this problem for a while and I need help!!
Answered by #Archer
The answer is b. because the number 81 is divided by 1/27 to get 3 and 3 divided by 1/27 is 1/9. If you really look at the statement I wrote you would see that 27 * 1/9 = 3.An arithmetic sequence is a sequence of numbers such that the difference between the consecutive terms is constant. In this sequence the difference between the consecutive terms isn't constant. So, the sequence is geometric.
Answered by Here to help <3
Yes, the answer is B.
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