You should have tried before asking... of course it can be...
In C and C++, as well as in many (all?) languages, a function can be called from more than one place in a program. That's the purpose of functions - to encapsulate pieces of code that are needed in more than one place in the program.
Assuming that the independent variable (often called "y") is along the vertical axis: to be a function, no vertical line may cross the graph in more than one place.
In simple terms, if a vertical line meets a graph in more than one place it is not a function.
In VBA, a macro is the name for the function that you can see on the GUI and use, and a function is a procedure called by a macro. A Macro is more "on the stage", and a Function is more "backstage".
No, it is not. A function can only have one output per input. (If it has more than one, it is still maths, but it cannot be called a "function". It would probably be called an equation or a formula etc...).
overload
More surface area to dissipate heat, the more exposed surface of a material the more place to 'let out' the heat
By definition. If one input has more than one outputs then it is not a function.
A place where two or more roads meet is called a JUNCTURE.
function is a self contained block or sub program of two or more statements which performs a special task when called.
function is a self contained block or sub program of two or more statements which performs a special task when called.
There are lots of places called London