81*(1/27)^n
what is that for n=1?
for n=2?
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.
8 answers
is it A?
no. what form is Ao* r^n ? You need to know that.
then its B
I guess it D Miranda
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!!
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.
Yes, the answer is B.