Meaning of Element methods

Hi at all,

I'm new student of Scala.

During some test that I'm doing, I have seen the class 
*scala.collection.IndexedSeqLike.Elements*

In this class there is a method: *aggregate*

The signature of the method is the question: 
def aggregate[B](z: ⇒ B)(seqop: (B, A) ⇒ B, combop: (B, B) ⇒ B): B


   1. What's mean of  z: => B ?
   2. What's mean of the 2 parenthesis: (z: ⇒ B)(seqop: (B, A) ⇒ B, combop: 
   (B, B) ⇒ B)

Can someone of us to explain to me?

Thanks a lot. :-)

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