Posted by **Lucy** on Saturday, March 29, 2008 at 6:37pm.

Solve, round to four decimal places if necessary:

log4(x-9)=2

Answer:

x-9=4^2

x-9=16

x=11

log4(z)+log4(z-3)=1

Answer:

z+z-3=1

2z=4

z=2

Thanks for checking my work.

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