exam Maths Puzzle Numerical Ability

I am taking an algebra class online and I have no idea how to work this problem. Could you please help?

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The question is square root 9 times square root 32 and simplify. I forgot how to do this can you please help me Can you please help me with this problem? Thanks!
A harmonic progression is a sequence of numbers whose reciprocals form an arithmetic progression. Insert two harmonic means betwe