Question

como insirir doze meios aritméticos entre 45 e -20

Answer 1

an= A1+(n-1).r
a14= A1+(14-1).r
-20= 45+(13).r
-20= 45+13r
-20-45= 13r
-65= 13r
r= -65/13
r= -5

(45,40,35,30,25,20,15,10,5,0,-5,-10,-15,-20)