7 + 7 + 7/7 = 15
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if you want the answer using bedmas/ order of operations it would be 591526. But if you want it just how it is it would be 1182898
That depends a lot on how often you may repeat each digit, and what operations are allowed. If you just want to write a four-digit number, using each digit once, start by writing the largest digit on the left, then continue with the second-largest, etc.
Yes, there are. Placing a question mark at the end of a phrase does not make it a sensible question. Try to use a whole sentence to describe what it is that you want answered.
Some rectangles do. We call those rectangles squares. There's not a "why", really, unless you want to get into etymology, in which case this question should be in language categories and not math categories.
It's not important at all, unless for some reason you want to end up with the correct answer. If you do the operations in a different order, the result will be wrong.