Unfortunately, the browser used to post questions on this site it virtually useless for mathematics because it strips out most symbols. So all we can see is "3z -5z z 0". It would make no sense for me to try and guess what the intended question was: I may as well make up my own question and answer it!
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1.0070 has 5 significant figures. This is because when you are looking at a number with a decimal number, you start from the left and find a non-zero number. When you find the non-zero number, every number after it is significant.
Divide a non-zero integer by a non-zero integer.
No.
This can not be done. Every non-negative number on the number line is the square root of its square. You would have to mark every number from zero on.
It is a non-zero integer.