math
posted by Hannah on .
write the expression as the logarithm of a single quantity.
2 In 8 + 5 In z
My answer is 7 In 8z but I don't not think this is right!

Nope, not right.
try these rules...
a ln b= ln( b^a)
and ln c + ln d= ln (cd). 
use the properties of logarithms to simplify the logarithmic expression.
log10 (9/300)
Please explain!!