in question 1

It's a logic problem.

WWWDOT - GOOGLE = DOTCOM or DOTCOM + GOOGLE = WWWDOT
(which can be rewritten to )

DOTCOM
GOOGLE
----------------
WWWDOT

Now it's easier to see the clues that are available.
For instance the L is either a 9 or a zero. if its 9 M+E>9, otherwise M+E<10
O+O=W
W is and even digit.
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Glenn