Using the number line shown, place a point at 4 and the opposite of 4 . Place a point at −2 and at the opposite of −2 . Place a point at 0 . Use a piece of paper to show your work. A vertical number line goes from negative 5 to 5. For parts (b) and (c), type each answer in the box below. b. Explain why the opposite of a positive number will always be a negative number. c. Explain why zero is its own opposite number.