Question

.

Answer 1

from definition of logs
15 = (1/2)^x

where x is the required log

Answer 2

take logs of both sides:

ln 15 = ln (1/2)^x = x* ln (1/2)

x = ln 15 / ln (1/2)

Answer 3

ok

Answer 4

it will equal to -3.9?

Answer 5

http://i729.photobucket.com/albums/ww292/akatushi101/img2-1.gif

Answer 6

right

Answer 7

so the answer is -3.9

Answer 8

it certainly is