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To determine the sign of the product of two numbers, you can use the following rules:
- The product of two positive numbers is positive.
- The product of two negative numbers is positive.
- The product of a positive number and a negative number is negative.
In this case, both numbers, -10.4 and -78.2, are negative.
Since the product of two negative numbers is positive, the sign of the product −10.4 × −78.2 is positive.
So, the answer is +.