Question

por favor me ajudem a resolver essas questões eu fiz mais n acho q esteja certa.​

Answer 1

$\boxed{a_n=a_kq^{n-k}}$

1.

$a_1=5$

$q=4$

$n=6$

$a_6=a_1q^5=5(4)^5=5(1024)\ \therefore$

$\boxed{a_6=5120}$

Letra D.

2.

$n=8$

$a_8=512$

$q=2$

$a_8=a_1q^7\ \to\ 512=a_12^7\ \to\ a_1=\dfrac{2^9}{2^7}\ \therefore$

$\boxed{a_1=4}$

Letra D.

3.

$a_1=1$

$q=2$

$a_{16}=a_1q^{15}=1(2)^{15}\ \therefore$

$\boxed{a_{16}=32768}$

Letra E.