How many solutions ?

Determine whether the following statements are true and give an explanation or counterexample. bold a. when using the shell method, the axis of the cylindrical shells is parallel to the axis of revolution. bold b. if a region is revolved about the y-axis, then the shell method must be used. bold c. if a region is revolved about the x-axis, then in principle it is possible to use the disk/washer method and integrate with respect to x or the shell method and integrate with respect to y.

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5

Typically a point in a three dimensional cartesian coordinate system is represented by which of the following answers in the picture !