exam Maths Puzzle Numerical Ability

Let a, b, c, be positive real numbers. If ab=48, bc=96, and ac=72, what is the value of abc?

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could you show me step by step how to do this problem:1/x^-4
Also could you tell me if this problem is right:5^-3*5^7=625
I know these are probably easy ones but I always second guess myself.
Thank you for your time.
Sincerely,JH Graph the following ewuation and compute the area it encloses:
abs(2x -10) + abs (5y - 10) = 20