What does the combination of letters and numbers in the C-12F Huron signify

Why is it essential to operationally define the variables in a study?

Which of the following contradictions best exemplifies why the democratic party struggled during the 1928 presidential election? a. it tried to appeal to religious fundamentalists along with committed secularists. b. it promoted jim crow laws but saw an influx of african american voters to its districts. c. it was forced to publicly endorse prohibition despite the objections of big businesses. d. it relied on the support of both the ku klux klan and roman catholic immigrants.

Tamara has a hard time remembering pin numbers for her credit cards, but she wants to keep the information secure. a. writing them down and keeping them in a safe place at home b. typing them on her smartphone so they are easily accessible c. typing them into her email and sending it to her personal email account d writing them down on one list in keeping them in her wallet