Question

Seja a PA ( 1, 3, 5,7, .......) qual é o 40º termo da sequência​

Answer 1

$\boxed{\begin{array}{l}\rm Seja~a~PA~(1,3,5,7,...).\\\sf Qual~\acute e~o~d\acute ecimo~termo~da~sequ\hat encia?\\\rm a)79\\\rm b)40\\\rm c)80\\\rm d)160\\\rm e)210\end{array}}$

$\large\boxed{\begin{array}{l}\tt dados\begin{cases}\sf a_4=7\\\sf r=3-1=2\\\sf a_{40}=?\end{cases}\\\underline{\rm soluc_{\!\!,}\tilde ao:}\\\sf a_{40}=a_4+36r\\\sf a_{40}=7+36\cdot2\\\sf a_{40}=7+72\\\sf a_{40}=79\\\huge\boxed{\boxed{\boxed{\boxed{\sf\maltese~alternativa~a}}}}\end{array}}$