For the quadratic equation 2x^2 - 4x + k = 0 to have real roots, what must be the condition on k?

C. K ? 8
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Which number is different from the others?

C. 24
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What is the product of the roots of the quadratic equation x^2 - 7x + 10 = 0?

A. 10
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If one root of the quadratic equation x^2 + 4x + k = 0 is double the other root, what is the value of k?

B. 8
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A : B :: C : ?

B. E
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