Question

1- calcule o 19°termo das P.As:

a- (3,5,7,9,11)
b-(4,2,.0,-2,-4)
c-(7,3,-1,-5)

Answer 1

Explicação passo-a-passo:

Letra a) an=a1+(an-1)×r

a19=3+(19-1)×2

a19=3+18×2

a19=3+36

a19=39

b) an=a1+(an-1)×r

a19=4+(19-1)×-2

a19=4+18×-2

a19=4-36

a19=-32

c) an=a1+(an-1)×r

a19=7+(19-1)×-4

a19=7+18×-4

a19=7-72

a19=-65