It indicates "plus or minus".
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a plus or minus sign your welcome ;D
In addition and subtraction, if the plus sign is larger than the minus sign, then it's a plus. For example: +10 minus -20 = -10 If the plus sign is smaller than the minus sign, the answer will be a minus. For example: -10 minus + 20 = -10 In multiplication, if you have 2 plus signs, the answer will be a plus sign. If you have 2 minus signs, the answer will be a plus sign then, too. But if you have a plus and a minus sign, then the answer will be a minus. For example: +5 x + 2 = +10 -5 x - 2 = +10 -5 x +2 = -10
A plus times a plus is still a plus. Below is the way I remembered it: If there is not a minus sign, it is plus (positive). If there is 1 minus sign, it is minus (negative). If there are 2 minus signs, it is plus (positive).
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The plus minus symbol means both plus and minus should be considered; or thata measurement or estimate may be plus or minus the number after the sign.For example, a measured temperature may be state as 123 +/- 0.2 C, which means temperature may be between 122.8 C and 123.2 C.An estimated attendance at an eventmay be given as 2500 +/- 100 , which means attendance should be between 2400 and 2600.The quadratic formula contains a plus minus sign, meaning that there are two roots to beobtained and given consideration.For example, t = 30 +/- 40 which means the answer may mathematically be 70 or - 10 , Realistically, the answer may be either or both numbers.