Question

If log10(x) =
−3
and log10(y) =
7
, what is log10(xy)?

Answer 1

Please see the attachment

Answer 2

If log10(x)=-3

THEREFORE X=10^-3

log10(y)=7

THEREFORE Y=10^7

And X.Y =10^4

log10(XY)

log10(10000)=4

Therefore answer is 4