Which of these are characteristics of variables? check all that apply. a. variables can be local or global. b. variables cannot be changed. c. variables have keys and values within brackets [ ]. d. variables have connected sets of characters. e. variables have names, extents, and scopes.

A and E for sure,

C and D, depends on the language and on what you learned, because question isn't clear.

Explanation:

Variables are a central part of any programming, because that allows your program to have memory of data/events.

a.Variables can be local or global. TRUE

Yes, depending on the programming language, there might be distinction between the local variable (within a function) and global variables.  

b. Variables cannot be changed. FALSE

Of course variables can be changed, that's why they are named that way.

c. Variables have keys and values within brackets [ ].  FALSE/TRUE

That's a tricky question to answer. Because SOME variables can have keys and values, they are a special kind of variables called arrays.  But not ALL variables are arrays, at least in most computer languages, most of the variable hold only one value.

d.Variables have connected sets of characters. FALSE/TRUE

Again that's a tricky question, because a variable can contain characters, but can also contain numbers, objects, arrays, functions even.

e.Variables have names, extents, and scopes. TRUE

All variables have a name (even if it's a default global system name) and extent and scope.

a and e i just answered the same question

Explanation: