The curve is given by y=the integral from 1 to x sqrt[sqrt(t) -1 dt, 1 <=x<=16

(basically the sqrt sign is over t-1 and the t also has a sqrt over it)

It asks to express the curve in the form r=r(t) on an Interval I and to find the length of the curve and is the curve smooth

*I don't understand by which the curve is given...I'm totally lost