Question

escreva a P.A em que o 4° termo  vale 24 e o 9°termo vale 49

Answer 1

$a_4=a_1+3r=24\\ a_9=a_1+8r=49\\ \\ a_9-a_4:\\ \\ 5r=25\\ \\ \boxed{r=5}$

$a_4=a_1+3r=24\\ a_1+15=24\\ \boxed{a_1=9}$

A PA é:  (9,14,19, 24,...)