Resposta :
[tex]\Large\boxed{\begin{array}{l}\sf a_1=3,25\\\sf r=1,20\\\sf a_5=a_1+4r\\\sf a_5=3,25+4\cdot1,20\\\sf a_5=3,25+4,80\\\sf a_5=8,05\\\sf o\,inteiro\,mais\,pr\acute oximo\,\acute e~~8\end{array}}[/tex]
[tex]\Large\boxed{\begin{array}{l}\sf a_1=3,25\\\sf r=1,20\\\sf a_5=a_1+4r\\\sf a_5=3,25+4\cdot1,20\\\sf a_5=3,25+4,80\\\sf a_5=8,05\\\sf o\,inteiro\,mais\,pr\acute oximo\,\acute e~~8\end{array}}[/tex]