3
4-5x(9+1)=
This is not an equation the "x" means times here. Note the question is in basic math section, so it does not yet involve algebra.
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First do the parantheses,
$\displaystyle 3^4-5\times (10)$
Now do exponents,
$\displaystyle 81-5\times 10$
Now do multiplication,
$\displaystyle 81-50$
Now you can substract,
$\displaystyle 41$
(Note I would like to mention, "order of operations" is not a theorem, it is simply used as a definition. In order to avoid ambiguity).