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Algebra Difficulty 3.0 AMC 10/12 Prove it Canada

The graph of $y=m^x$ passes through the points $(2,5)$ and $(5,n)$ . What is the value of $mn$ ?

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Source: CEMC, University of Waterloo, licensed CC-BY-NC-4.0. Statement reproduced verbatim; metadata (topic, difficulty) added by this project. Solutions are the publisher's, linked not copied.