Question

What is the 7th term of the geometric sequence –1, 3, –9, …?

Answer 1

hint: formula for geometric sequence is \[A_n = A_1 r^{n-1}\]
in your problem the first number is -1; you keep multiplying each number by -3; you're looking for the 11th term

does that help?

Answer 2

so a(n)=-1(r)^n-1
Whats r and n?

Answer 3

Or the 7th term. r is -3 and n is 7 for the 7th term.

Answer 4

hmm weird...it was 11th term a while ago...

Answer 5

Hmm. Either the question was edited or you are going crazy. Are you hearing voices, @lgbasallote ?

Answer 6

no..but i am seeing things..

Answer 7

I just typed my question here. Im confused now.

Answer 8

back to earth guys. thanks
this is what I do right?

Answer 9

-1(-3)^7-1?

Answer 10

3^6?

Answer 11

yes that

Answer 12

729?

Answer 13

remind me where the -1 went?

Answer 14

I want to believe.

@mother123 yes and no. Careful the -1 is outside the ().

Answer 15

remember you raise -3 to 6 before multiplying to -1

Answer 16

-3^6= -729 so then multiply that my -1 so thats 729?

Answer 17

no...

Answer 18

(-3)^6 is 729

Answer 19

ohh wait you have to you parenthesis?

Answer 20

yes

Answer 21

oh okayy! got it! thanks so much!

Answer 22

welcome