Assessment Problem:

Mary has the following problem to solve: “Find value(s) for x in the expression: x + x + x = 12” She answered in the following manner.

a. 2, 5, 5

b. 10, 1, 1

c. 4, 4, 4

Which of her answer(s) is (are) correct? (Circle the letter(s) that are correct: a,b,c)

State the reason for your selection.

Mathematical Issues:

Discusses the concept that the variable x must be the same value at the same time within the context of a particular problem.

Domain:

Variables & Expressions

Research References:

Fujii (2003)