Question

What is the value of the 11th term in the sequence -3, -6, -12, -24, ...?



-6,144

-118,098

-3,072

-354,294

Answer 1

You can see that its being multiplied by 2 so the ratio is 2.

With the given information just plug in into the formula: a_n = a1 • r^n-1

a1 = -3
r = 2

Plug in 11 for n,

a_11 = -3 • 2^11-1

a_11 = -3• 2^10

Can you continue?

Answer 2

-3 x 20?

Answer 3

No no

Answer 4

2 10 times

Answer 5

No, 2^10 = 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2 * 2

2^10 isn't 2 * 10

Answer 6

3,072

Answer 7

-3,072 *

Answer 8

-3 * 1,024 = -3,072

Answer 9

ahh sorry forgot the negative

Answer 10

yup, good job ;p