Question

What is the common ratio for the sequence 1024, 512, 256, 128,.... (1 point)



What is the 10th term of the above sequence? (2 points: 1 for work shown using the geometric sequence formula, 1 for correct answer)

Answer 1

to find the common ratio divide any term by the previous one :-

for example 128/256 = ?

Answer 2

You need to find its ratio using method as Welshfella said.

Then, you can plug it to formula :
un=arn−1


with a is the first term on its sequence and n = 10.
Finally, you will get the 10th term.