Practice Japan questions with answers and explanations.
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Mean = (12 + 8 + 1 + 20)/4 = 10.25.
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f(7)=2×7+9=23.
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10% of 30 = 3.
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Area = 7 × 9 = 63 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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10% of 42 = 4.2.
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Mean = (5 + 6 + 11 + 11)/4 = 8.25.
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f(7)=6×7+10=52.
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f(7)=4×7+11=39.
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10% of 34 = 3.4.
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Area = 10 × 5 = 50 cm².
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By Vieta’s formula, the sum of the roots is the coefficient of x with sign changed.
