Question

The sign of the product of -21 and 451 is

Answer 1

The product of any positive and negative numbers are always negative.
Note:
+ • + = +
+ • - = -
- • - = +

Answer 2

The sign of the product of -21 and 451 is going to be negative. That is because of the rule when you are multiplying a positive number times a negative number. A positive number times a negative number will always be negative. Here are some helpful rules to know:

positive * positive = positive

negative * positive = negative

negative * negative = positive (the negatives cancel each other out)

Since this question has numbers that fit the second case, the answer will be negative.