Final answer:
Expressions A, 2×8, and C, -2 times -2, along with E, -40 divided by -8, have positive values. This is because the multiplication or division of two positive numbers or two negative numbers results in a positive outcome.
Step-by-step explanation:
The expressions that have a positive value are A and C:
- A. 2×8: When two positive numbers multiply, the result is positive. For example, 2x3 = 6. Therefore, 2×8 = 16, which is positive.
- C. -2 times -2: When two negative numbers multiply, the result is also positive. For example, (-4) x (-3) = 12. Thus, -2 times -2 = 4, which is positive.
- E. -40 divided by -8: When a negative number is divided by another negative number, the result is positive. Following the multiplication rules for signs, -40 divided by -8 equals 5, which is positive.
Expressions B and D have negative values because they involve multiplication or division with one positive and one negative number.