need all of them asap! please 21. Find the volume of the solid generated by revolving the region bounded by the graphs of the equations about the line x - 2. y = 2x y=0 , x =2 22. Find the arc length of the graph of the function over the indicated interval. [1 . 27] 23. Find a set of parametric equations for the rectangular equation that satisfies the given condition. y - 4x +1 , 1= 1 at the point( 2. -7) 24. Find dy/ dx and find the slope at 0 -- x - 2+sec0 . y = 1+ 2 tan @ 25. Find the area of the surface generated by revolving the polar equation over the given interval about the line a cose 0585