Question

PA de de 6termos em que:a6=19 e r=2

Answer 1

an=a1+(n-1)*r

19=a1+(6-1)*2

19-10=a1

a1=9
a2=9+2=11
a3=11+2=13
a4=13+2=15
a5=15+2=17
a6=17+2=19

Answer 2

19=a1+(6-1)*2
19=a1+5*2
19=a1+10
19-10=a1
a1=9

(9,11,13,15,17,19)