Question

What is the 7th term of the geometric sequence where a1 = 1,024 and a4 = -16?

Answer 1

a4=ar^4-1
-16=1024r^3
thus r=-1/4

Answer 2

-__- i didn't get that when i tried it

Answer 3

7 th term
a7=a1r^7-1
a7=1024(-1/4)^6

a7=-0.25 answer

Answer 4

thanks

Answer 5

whats the geometric series formula?

Answer 6

an=a1r^n-1

Answer 7

umm actually the one where you'd need to find the sum of everything

Answer 8

sum
s=a1(r^n-1)/r-1

Answer 9

ohh ahaha i got the things inside the parenthesis switched around ahaha thanks

Answer 10

For future reference, -0.25 is not correct.

Answer 11

Thank you @etessa7416

Answer 12

Etessa7416 is right, I just took the test. The correct answer is 0.25, without the negative :)