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What is the eccentricity of the ellipse 9x² + 25y² = 225?
A5/4
B3/5
C4/5
D16/25
Answer & Solution
Correct answer: C. 4/5
Dividing by 225 gives x²/25 + y²/9 = 1, so c = 4 and e = 4/5.
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