Find the product.

is a positive integer; and are negative integers. Which of the following three expressions must be negative?

I)

II)

III)

Let be a negative integer and be a nonzero integer. Which of the following must be negative regardless of whether is positive or negative?

Given that are both integers, , and , which of the following is correct about the sign of the expression ?

and are positive numbers; is a negative number. All of the following must be positive except:

Find the product.

, , and are all negative numbers. Which of the following must be positive?

If is a positive number, and is also a positive number, what is a possible value for ?

, , and are all negative odd integers. Which of the following three expressions must be positive?

I)

II)

III)