Question

Use the information given to identify the a9 term of the geometric sequence: a9 = 5, r = −2.

Answer 1

a9 = 320
a9 = −2,560
a9 =2,560
a9 = −320

Answer 2

@mathmath333

Answer 3

i need to know how to set up this formula

Answer 4

some information seems missing check the question written again

Answer 5

its all there

Answer 6

I'm a little confused?
did they give you that a9 = 5 ?

Answer 7

yes, that whats confusing me

Answer 8

a9 = 5, r = −2

the above is given

and the same a9 is in options too ?

Answer 9

they say use a9=5 to get the terms

Answer 10

@bibby

Answer 11

that doesn't make any sense.

Answer 12

wolfram does gives

http://www.wolframalpha.com/input/?i=5%28-2%29%5E9

Answer 13

is it just weirdly worded?

Answer 14

but in my opinion the question is wrong