Question

if a 6 volt and a 9 volt source are connected in series aiding the total voltage is​

Answer 1

Here,

V¹ = 6V and V² = 9V

V = V¹ + V²

V = 6 + 9

V = 15V

Answer 2

Two voltagesare connected in series aiding,total    voltage equal to sum of two voltage.

they have askd total voltage so;

v=v1+v2;

v=6+9

15

so,the total voltage is 15