What does a variable do?A variable solves for x. A variable solves for x. A variable helps scientists make studies of control groups. A variable helps scientists make studies of control groups. A variable names a memory location to hold different values in your program. A variable names a memory location to hold different values in your program. A variable evaluates a boolean expression. A variable evaluates a boolean expression.

the today function returns a valid value without any arguments.

the today function returns the current date based on the computer's date setting and formatted as a date. today takes no parameters, but requires that you use empty parentheses

the answer is b. executive summary. a management summary, or executive summary, is a short article or section of a document, produced for business purposes, that condenses a longer report or proposal or a group of related reports in such a way that readers can rapidly become familiar with a large body of material without having to read it all.