Add them up and divide by 5 = 7.6
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the reciprocal (aka multiplicative inverse) of a number is 1/number, so the reciprocal of -13 is -1/13 (I moved the negative from the 13 to the 1 as per convention, 1/-13 = -1/13). The reciprocal of any number is what you have to multiply that number by to yield 1. -13 * -1/13 = (-13*-1)/13 = 13/13 = 1
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13 = 13/1
To get 13, you would multiply 1 and 13. This is because 1 multiplied by any number equals that number. In this case, 1 multiplied by 13 equals 13.
Since 13 is a prime number, the only factors that it has are 1 and 13.