Which of the following best exemplifies progressive formalization?
a. A student initially uses informal language to describe a linear relationship represented in a story. Later on, she uses conventional algebraic symbols to describe and investigate the situation.
b. A student gradually becomes more comfortable sharing his or her mathematical ideas with a teacher by using the teacher's formal title.
c. Students learn how to multiply binomials by using the FOIL method, and then later learn why the FOIL method works.
d. At the beginning of an algebra unit on the slope of a line, the teacher informs students that the literal symbol "m" is usually used to represent slope.
Ans: a
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