Q: How will you know a function when you see one?

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U can see if there is and input that can go into two outputs if there is it's not a function if there is and imput that only goes in to one output it's is a function

A linear function has and x and a y and neither one is raised to a power other than 1.

One way is to try the vertical line test on a graph!

You need to know the domain in order to find the range.

One to one functions on a graph can vary. To determine if a function is one to one, a horizontal line can only intersect the function once. If it intersects the function more than once, it is not a one to one function.

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The basic function of eye is to see the thing around us.

to see or to view one's image

i one to know more about housekeeping

By definition. If one input has more than one outputs then it is not a function.

A differentiable function, possibly - to distinguish it from one whose graph is a kinked curve.

The IF function is a conditional function. See the related question below.

The main way that a graph can be defined as a function is if it passes the vertical line test; this means that each individual x must correspond to one specific value of y. In the situation you mentioned, we don't know if the graph in question really is a function, because we only see the point at y; we don't know if the graph loops around on itself and fails the vertical line test at any other point.

It is called callback function. For an example see the qsort function.

You don't have to know. Library functions are also written by somebody, aren't they?

One can see photos of celebrities without makeup on Google Images by simply using their search function. One can also find such pictures on 'wetpaint' and 'Celebuzz'.

don't know i think you can see them with your mind or you are scared or you see ghosts just like that....

A graph is a function if there is no more than one y-value for any x value. This means no vertical lines or "C" shapes, etc