Posted by **Hannah** on Tuesday, July 28, 2009 at 1:46pm.

write the expression as the logarithm of a single quantity.

2 In 8 + 5 In z

My answer is 7 In 8z but I dont not think this is right!

- math -
**bobpursley**, Tuesday, July 28, 2009 at 1:49pm
Nope, not right.

try these rules...

a ln b= ln( b^a)

and ln c + ln d= ln (cd).

- math -
**Hannah**, Tuesday, July 28, 2009 at 7:51pm
use the properties of logarithms to simplify the logarithmic expression.

log10 (9/300)

Please explain!!

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