Question

Find the 9th term of geometric sequence 10,40,160,...

Answer 1

≈≈> 10 , 40 , 160 , 640 , 1280 ,2560 , 10240 , 40960 and 163840.

Answer 2

Answer:

$a = 10$

$r = \frac{40}{10}$

$r = 4$

$a_9 = 10×(4)^{(9-1)}$

$a_9 = 655360$