Question

please help. find the arithmetic mean given a^n-l=2 a^n+1=8. thank you

Answer 1

\[
a_{n-1}=2,\;a_{n+1}=8
\]Is this it?

Answer 2

yes

Answer 3

The arithmetic mean is just the sum of the terms divided by the number of terms.

Answer 4

Do they really want the man, or do they want the sequence? I'm find the question quite strange.

Answer 5

mean^

Answer 6

the mean

Answer 7

i m not sure how to do it though

Answer 8

Me neither, not because I don't know how, but I don't understand what they want the mean of.

Answer 9

The mean of 8 and 2 is (8+2)/2 = 5

Answer 10

But I get the feeling that isn't what they want.

Answer 11

i think it is its just the arithmetic mean.