Question

Find the 7th term in the sequence? -1,-3,-9

Answer 1

Answer:

-729

Step-by-step explanation:

Given is a geometric sequence.

Therefore,

a = - 1, r = - 3 /(-1) = 3, n = 7

$a_7 =?$

$\because a_n = ar^{n-1}$

$\therefore a_7 = (-1)(3)^{7-1}$

$\therefore a_7 = (-1)(3)^{6}$

$\therefore a_7 = (-1)(729)$

$\therefore a_7 = -729$

Answer 2

Answer: -21, what ever number you have you subtract 3 from that number. So after -9 would be -12 and so on