Question

To determine the sign of the product of \(-10.4\) and \(-78.2\), we need to consider the signs of the numbers being multiplied.

Both \(-10.4\) and \(-78.2\) are negative numbers.

The product of two negative numbers is always positive.

Therefore, the sign of the product \(-10.4 \times -78.2\) is \(+\).

So, the answer is: +