Question

1) determine o 19° termo da pá (28,36,44,52,...) fórmula:an=a1+(n-1).r​

Answer 1

Resposta:a19=172

Explicação passo-a-passo:

a1=28,r=a2-a1--->r=36-28--->r=8,n=19,a19=?

an=a1+(n-1).r

a19=28+(19-1).8

a19=28+18.8

a19=28+144

a19=172

Answer 2

$a_n=a_1+(n-1)\cdot r$

$a_{19}=28+ (19-1)\cdot 8$

$a_{19}=28+18 \cdot8$

$a_{19}=28+ 144$

$\red{\boldsymbol{ a_{19}= 172}}$