Question

It helps classify animals according to their needs.

Answer 1

1st: -2*2^(1-1) = -2*1 = -2

4th: -2*2^(4-1) = -2 *8 = -16

8th = -2*2^(8-1) = -2*128 = -256

Last choice is correct

Answer 2

$A_n=-2 \cdot 2^{n-1} \\ \\ A_1=-2\cdot 1=-2\\A_4=-2\cdot 2^{4-1}=-2 \cdot 2^3=-2 \cdot8=-16 \\ A_8=-2\cdot 2^{8-1}=-2 \cdot 2^7=-2 \cdot128=-256$

The answer is D. -2, -16, -256