Stabiliti care dintre urmatoarele nr sunt patrate perfecte 36,4,15,22,56,169,190,196,225,240,2 56

Can someone me with my hwplz(only the circled ones)

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.

Need on this one asap im almost done with this subject