Please help marking brainlest
no links or no unnecessary comments ty

When turned about its axis of rotation, which shape could have created this three-dimensional object?

Could somebody me with this radical simplification?

Aword processing program requires a 7- digit registration code made up of the digits 1,2,4,5,6,7 and 9 each number has to be used and no number can be used mor than once how many codes are possible