A ____ row is the first row of a table that contains the column headings.

Which expression is true?

a) The expression a * (b + c) + c * (d + e) contains nested parentheses. b) The expression y = a * x * x + b * x + c does exponentiation without an exponentiation operator. c) The C standard library provides function power to perform expo-nentiation. d) When we say evaluation of an expression proceeds from left to right we are referring to the additivity of the operators.

Case-Based Critical Thinking QuestionsCase 18-1Sarah wants to learn more about computer programming and the techniques used to code a program. Since there are so many different programming languages, she has decided to start by working with Python. Sarah wants to set up a scenario that requires the user to choose between two variables. She has learned that Python uses ____ as the keywords for a selection control structure.

A. IF and THEN B. ELSE and OR C. SAVE and PRINT D. IF and ELSE