Find the four arithmetic means between -21 and
-36. I got -24,-27,-30 and -33. Could you please show the work. I am trying to find out where I went wrong in my formula

Question

Find the four arithmetic means between -21 and 
-36. I got -24,-27,-30 and -33. Could you please show the work. I am trying to find out where I went wrong in my formula

hartnn · Answer

arithmatic mean(AM) between 'a' and 'b' is (a+b)/2
so what is AM between -21 and -36 ??

hartnn · Answer

can you find out ?

anonymous · Answer

Im not sure exactly. We just started working on this today.

hartnn · Answer

its not at all difficult.
i'll give you an example.
AM between -12  and  -18 will be
(-12-18)/2 = -20/2 = -15.
so, in same way , what is AM between -21 and -36 ???
just give it a try.

anonymous · Answer

a = -21

a6 = -36

a + 5 d = -36

-21 + 5d = -36

5d = -15

d = -3

sirm3d · Answer

if there are four arithmetic means, there's a term before and a term after. That should be six terms in arithmetic progression.

anonymous · Answer

Lol..@sirm3d

sirm3d · Answer

you beat me again. hahaha.