Question

If three arithmetic means are inserted between -15 and 9, find the first of these arithmetic means.

Answer 1

Answer:

-9

Step-by-step explanation:

As given in the question, there are 3 arithmetic means between -15 and 9.

-15, __ , __ , __ , 9

By adding the first and last term, we get the middle arithmetic mean which is as follows:

(-15 + 9)/2 = -3

Hence we got the middle term: -15, __ , -3, __, 9

And now by adding the first and third term we will get the first arithmetic mean; as follows:

{-15 + (-3) }/2 = -18/2 = -9

Therefore the first arithmetic mean is "-9"