Question 1136188
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You are given that the semi-axes are 10/2 = 5 mi and 4/2=2 mi.


Hence, the equation is


    {{{x^2/25}}} + {{{y^2/4}}} = 1,   or


    {{{x^2/4}}} + {{{y^2/25}}} = 1.
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Answered and completed.