Question

PLEASE PLEASE help me!! Either wolfram alpha is wrong or my test is showing the wrong data.

Answer 1

?

Answer 2

For example,
log(x+7)-logx = 3 returns x = 0.36677
but that doesnt match any of the available answers.

Answer 3

what is base of log?
wolfram uses natural log as default "log"

Answer 4

A.) 3.5
B.) 142.7
C.) 0.0070
D.) 0.0707

Answer 5

its base 10

http://www.wolframalpha.com/input/?i=log_10%28x%2B7%29+-+log_10%28x%29+%3D+3

Answer 6

Aw crud, how did i miss that...
Thank you so much! :P