[tex]\large\boxed{\begin{array}{l}\tt dados\begin{cases}\sf a_2=10\\\sf r=10-3=7\\\sf a_5=?\end{cases}\\\underline{\rm soluc_{\!\!,}\tilde ao:}\\\sf a_5=a_2+3r\\\sf a_5=10+3\cdot7\\\sf a_5=10+21\\\sf a_5=31\\\huge\boxed{\boxed{\boxed{\boxed{\sf\maltese~alternativa~E}}}}\end{array}}[/tex]
