Please help me with these problems. These problems are from geometry (10th grade).

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

This race was first held in 1953 on august 16th. every decade the race finishes with a festival. how many years is this?

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .