Question

how do u solve log(5+x)-log(x-4)=log 2

Answer 1

log a - log b = log(a/b)

Answer 2

log (5+x)/(x-4) = log 2
(5 + x)/(x+4) = 2
- solve this in normal way

Answer 3

Subtraction of logs becomes a division so: log(5+x)-log(x-4)=log((5+x)/(x-4))=log(2). Raise everything to the 10^ giving. (5+x)/(x-4)=2 Then multiply, combine terms, etc.

Answer 4

use property of log:
log b= log(a)<=>a=b
loga-logb=log(a/b)

Answer 5

so it would be (5+x)/(x-4)=2

Answer 6

yep

Answer 7

well u got to solve that for x of course

Answer 8

of i got 13

Answer 9

Thats what I got with mental math xP

Answer 10

thank you

Answer 11

(5+x) = 2(x-4)
x = 5+8 = 13 - yes

Answer 12

can u help me with this one How long will it take for a poulation of 4000 to double if its annual growth is 7.1% (Round to the nearest year)

Answer 13

ok
8000 = 4000(1 + (7.1/100))^x
(1 + (7.1/100))^x = 2
taking logs:
x log 1.071 = log 2
x = log 2/ log 1.071
x = 10.1 = 10 years

Answer 14

thanks i i am goint to take my test right now my final

Answer 15

so bye