thanks TD for the reply i don't know but my answear before i look into the solution was the same as yours but in the book called Calculus for Swokoski it says an infinite number. so if anyone can explain the answear to me i would be gratefull.
Well I said minimally; i.e. you can't express it in a smaller number of functions.
Of course, trivially, you can always break it up into (infinitely many) different functions.
how can i break it into infinitaley other functions?you mean i will be expressing x as another function of time for example?and how can a numebr after being square rooted be negative?