can someone help me with this question is really confusing and I don't understand, I need it by Tuesday, please... I'm desperate

Calculate the average speed and the average velocity for a ball that is moved according to the following instructions.

the ball (x,y)i=(10.0,-5.0)m

the ball along any curved path somewhere near (x,y)f=(-20.0,-10.0)m.

a.the average speed calculations

b.the average velocity calculations 

c.why the average speed always greater than the magnitude of the average velocity?

can you please show the procedure so I can understand how to do this equation. thank you