If logm equals x and logn equals y then mn equals?

Answer 1

Assuming that these are base 10 logs, which most of this notation are (though some insist on using the notation for base e logs):

log m = x

m = 10^x

log n = y

n = 10^y

mn = 10^x * 10^y

= 10^(x+y)

Depending on how you would prefer to write it.