Calculate the distance between (-2,-3) and (-6,1)

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.

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?