[tex] > resolucao \\ \\ \geqslant progressao \: aritmetica \\ \\ an = a1 + (n - 1)r \\ 104 = - 10 + (20 - 1)r \\ 104 = - 10 + 19r \\ 104 + 10 = 19r \\ 114 = 19r \\ r = \frac{114}{19} \\ r = 6 \\ \\ \\ > < > < > < > < > [/tex]