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How to go "build" the text of a formula if you are expecting student to type out the formula, and not a numerical answer?

Question asked by Dr. Maria M. L. Petrie on Sep 28, 2019

I am trying to use Formula Question in Quizzes to "build" a text answer of a formula that includes or not sections of text depending on the random value of a variable in the body of the question.  I see lots of examples of how to get a numerical answer for a mathematical formula based on random value of a variable, and have mastered that.  There are formula functions that deal with strings (letters in the text) so I believe it can be used to display the text of a formula if what you are asking is for the student to give an algebraic expression (text) instead of a numerical answer, and the text expression depends on random value variables.