Photoshop questions.  No version has overall relevance just an overview. 

1.What is the difference between open and closed paths?
2.How do paths differ from a bitmapped object in an image?
3.How does the pen tool inidcate that you are about to close a path?
4.Explain the concept of layers?
5.What advantage do layers have?
6.An image with 10 layers (including the backgroud layer), i merge
layer 8 and 4 and i merge 1 and 7, how many layers do i have?

7.How do masks save time?
8.What do masks do?
9.What is the difference between a mask and a quick mask?
10.what is the difference between layers and chanels?
11.what are slices useful for?
12.what happenes to the image areas not defined by a user slice?
13.Why would you use a NO Image Slice?
14.Why is the order of linking slices important?
15.What is the difference between rollovers and secondary rollovers?
16.Discribe a simple way to create rollovers and secondary rollovers.  
17.What does the tween function do?
18.what is the key image element to creating animations?

Andy, 

You're asking 18 questions for $4.5... 

I suggest you'll have a look here: 
https://answers.google.com/answers/pricing.html

thanks, there not the most difficult/long winded questions in the
world so i think thats better???

1.What is the difference between open and closed paths?Paths can be
open or closed. Open paths have two distinct end points. Closed paths
are continuous. The circle is an example of closed path.
4.Explain the concept of layers?Layers are like transparencies stacked
one on top of one another. Each layer can have different images and
effects. When the layers are stacked, the images appear as if they are
all a single image.
5.What advantage do layers have?Layers allow users to work on separate
images in order to modify sections without changing the entire image.
6.An image with 10 layers (including the backgroud layer), i merge
layer 8 and 4 and i merge 1 and 7, how many layers do i have? 8