What suggestion presented in your textbook for using supporting materials is used in the following speech excerpt?
Since it first opened for business, McDonald's has sold more than 100 billion hamburgers. To give you an idea how many hamburgers that is, think of it this way: Since each McDonald's burger (with the bun) is about 2 inches thick, 100 billion hamburgers stacked on top of each other would reach over 3 million miles⎯fifteen times as far as the moon.
a. Explain your statistics.
b. Present testimony from qualified sources.
c. Use examples to quantify ideas.
d. Quote or paraphrase accurately.