A+ and Basic PC Question:

What are data files in A+ known as and why?
Define any two display classes used in A+?
What is acronym of BASIC?
What was the purpose of creating BASIC?
How is basic different from other programming languages?
What is the purpose of subroutines in reference to BASIC?
How are numbers represented in BASIC?
What are variables and how are they denoted in BASIC?
Define expressions in basic with the help of an example?
State the rules by which an expression is interpreted?