What is the sign of a • b​

There is no sign it should be unitless

Step-by-step explanation:

Answer and Step-by-step explanation:

Assuming that both values of a and b are positive, we get the result to be positive, so a + sign (though you don't have to put that in front of the value).

When you multiply 2 positive values, the result is always positive.

Multiplying a positive and a negative value results in a negative value.

Multiplying 2 negative values together results in a positive value.

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I hope this helps!