ok this my other log problem i having, i make attempt here

express as a single log and evaluate

2 log5 50-log520-2log510+log5100

first i make this =log 5 50x20x100/100

=log5 1000

=log 5 10^3

=10

i not sure if this is correct ???

Thanks you for any helping !!

other problem i had was log 5 40 to calculate i get 5.3219 do i use calculator correctly ??