Look at the bottom of the calculator. There is a button that looks like this (-). Press that button and then press the number you want to be negative and you have a negative number. It's not as hard as you think:)
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The product of three negative numbers is negative.
They will be negative numbers as for example -5+(-7) = -12
You'll have to make some modifications to the "standard" radix sort. You can add on a set value to make all the numbers positive, then sort with radix sort, then subtract the value off all of them at the end. This probably isn't the best all-round solution because if your numbers get very large (and large negative numbers), you may be unable to add on the set value to make all your values positive without having the problem of overflow. In this case you'd have to make a division - a section of negative numbers, and a section of of positive numbers. Sort both of them using radix sort, then reverse the negative numbers section and put the lists together (remembering to sort out the minus signs before sorting the negative numbers).
No, it is measured in positive numbers but it can be represented by negative numbers.