3. Let a and b be two unequal numbers from R. A. The difference ba is not necessarily positive. Explain. B. The absolute value b - al is necessarily positive, and (assuming that b lies to the right of a on the number line) the resulting value is frequently called the width of the interval (a, b). Thinking visually in terms of a horizontally-oriented number line, explain why this choice of words makes sense. C. (Henceforth, assume b lies to the right of a on the number line.) The real number a+b is frequently called the midpoint of the interval (a, b). Thinking visually in terms of a horizontally-oriented number line, explain why this choice of words makes sense.

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