9 is 25% of what number​

Which statement about perfect cubes is true

The following frequency table relates the weekly sales of bicycles at a given store over a 42-week period. value01234567frequency367108521(a) in how many weeks were at least 2 bikes sold? (b) in how many weeks were at least 5 bikes sold? (c) in how many weeks were an even number of bikes sold?

Evaluate cos2θ for cosθ = square root of 3/2