It is just a symbol
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The plus sign is used to indicate a pharmacy.And the aid sign
No. It is already indicated that it is positive without the positive sign on the number.
The person who invented the plus sign is the same as the minus
To find the additive inverse of any number, just change the plus sign (or no sign) to a minus sign, or (as in this case), if there already is a minus sign, change it to a plus sign (or no sign).
Protons hold a positive sign, which is represented by the plus sign. Similarly, electrons hold a negative charge, which is represented by a negative sign.