Question

what are the two arithmetic means between -13 and 8?

Answer 1

let a1 and a2 be two A.M's between -13 and 8
-13,a1,a2,8 are in A.P.
let d be common difference.
first term a=-13
n=4
last term =8
\[l=a+(n-1)d\]
8=-13+(4-1)d
8+13=3d
d=21/3=7
a1=-13+7=-6
a2=-6+7=?