Question

Determine o décimo sexto termo da P.A sabendo que A1=16 e R= -2 (resp: -14 )

Answer 1

a16=
a1=16
r=-2

a16=a1+15r
a16=16+15.(-2)
a16= 16-30
a16= - 14

PA ( 16,14,12,10,8,6,4,2,0,-2,-4,-6,-8,-10,-12,-14)