Question

How do I solve this? General formula for nth term?

Answer 1

you need to find the 1st term, a, in a geometric sequence

you know r = 1/2 and n = 5 and the 5th term is 1/8

so the formula is

\[a_{n} = a \times r^{n - 1}\]

so using the information

\[\frac{1}{8} = a \times (\frac{1}{2})^{5 - 1}\]

or

\[\frac{1}{8} = a \times (\frac{1}{2})^4\]

when you find a, substitute it into the general formula above with r 1/2 and using n

Answer 2

@campbell_st still not quite understanding, what do I need to substitute?

Answer 3

1 /2 to the squared root of 4 is what

Answer 4

.25 or 1/4

Answer 5

Then u divide 1/4 by 1/8

Answer 6

@JoeJoldin