Question

Form a sequence that has two arithmetic means between -18 and -144

Answer 1

let a1 and a2 be two A.M's between -18 and -144 then -18,a1,a2,-144 are in A.P
let d be c.d
an=a+(n-1)d
an=-144
a=-18
n=4
-144=-18+(4-1)d
-144+18=3d
find d then a1,a2

Answer 2

Thank you!

Answer 3

yw