exam Maths Puzzle Numerical Ability

What is the volume of a frustum with the radius of the top = .525cm, the radius of the bottom = .735cm and the height is 3.85? I could really use the help!

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Please help me solve this equation.

36x^2=25 a plane flies 720 mi agains a steady 30 mi/h headwind and then returns to the same point with the wind. If the entire trip take 10 h, what is the plane's speed in still air?