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The expression     $\\var{a}\\times\\var{a}\\times\\var{a}\\times\\var{a}$     can be written as . . .

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$\\var{a}^4$

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$\\var{a}\\var{a}\\var{a}\\var{a}$

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${\\var{4a}}$

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$4$

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Write multiples as power

"}, "contributors": [{"name": "Michael Proudman", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/269/"}, {"name": "chris garston", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/3048/"}]}]}], "contributors": [{"name": "Michael Proudman", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/269/"}, {"name": "chris garston", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/3048/"}]}