Practice japan-common-test-math-ia questions with answers and explanations.
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By Vieta’s formula, the sum of the roots is the coefficient of x with sign changed.
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Use combinations: C(6,4) = 15.
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f(7)=6×7+7=49.
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10% of 34 = 3.4.
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Area = 9 × 14 = 126 cm².
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By Vieta’s formula, the sum of the roots is the coefficient of x with sign changed.
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Use combinations: C(12,2) = 66.
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Probability = favourable outcomes ÷ total outcomes.
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Mean = (4 + 15 + 6 + 19)/4 = 11.
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f(7)=2×7+6=20.
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10% of 42 = 4.2.
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Area = 16 × 16 = 256 cm².
