Question

4) Dada a P.A. (4,1,...) determine a12​

Answer 1

$> resolucao \\ \\ \geqslant progressao \: aritmetica \\ \\ r = a2 - a1 \\ r = 1 - 4 \\ r = - 3 \\ \\ \\ \geqslant o \: decimo \: segundo \: termo \: da \: pa \\ \\ \\ an = a1 + (n - 1)r \\ an = 4 + (12 - 1) - 3 \\ an = 4 + 11 \times ( - 3) \\ an = 4 + ( - 33) \\ an = 4 - 33 \\ an = - 29 \\ \\ \\ > < < > > < < > > < < > < > > <$