Practice Japan questions with answers and explanations.
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10% of 46 = 4.6.
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Area = 4 × 13 = 52 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(7,2) = 21.
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Probability = favourable outcomes ÷ total outcomes.
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Mean = (16 + 14 + 4 + 30)/4 = 16.
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f(7)=2×7+6=20.
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10% of 34 = 3.4.
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Area = 11 × 15 = 165 cm².
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10% of 38 = 3.8.
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Area = 14 × 11 = 154 cm².
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By Vieta’s formula, the sum of the roots is the coefficient of x with sign changed.
