Question

calcule a razao das progessoes aritmeticas -7 -3 1​

Answer 1

$(a_1,a_2,a_3,\dots)=(-7,-3,1,\dots)\\\\ \boxed{a_n=a_k+(n-k)r}\ \therefore\ a_2=a_1+r\ \therefore\\\\ -3=-7+r\ \therefore\ \boxed{r=4}$