Question

Interpole seis meios aritméticos entre 7 e -28

Answer 1

a1 = 7
an = -28
n= 8 (seis termos mais as duas extremidades)

an = a1 + (n-1)r
-28 = 7 + (8-1)r
-28 - 7 = 8r - r
-35 = 7r
r = -35:7
r= - 5

7 ___ ___ ___ ___ ___ ___ -28
7,  2,    -3,  -8,   -13,-18, -23, -28
PA( 7,2,-3,-8,-13,-18,-23,-28)