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Samuel could round both of the individual numbers, to get s rounded answer. So, he could round 23 to 20, and 395 to 400, to get a product of 8000.
Or, he could multiply the numbers first, so 23*395 to get a product of 9085, which would then round to 9000, or depends on what place value it would want to be rounded to.
If you are talking about building blocks, then you would get one 10 and 3 ones, then subtract that from 7 ones and would get 6
Ok this is a negative number.
All negative numbers have argument

Obviously, the module of this number is

The general trigonometric form of a complex number is:

We deduce the trigonometric for of -4: