Common Test Mathematics I/A practice 78: Using the accompanying practice context, for f(x)=2x+9, find f(7).
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f(7)=2×7+9=23.
Practice japan-common-test-math-ia questions with answers and explanations.
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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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10% of 42 = 4.2.
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Area = 17 × 7 = 119 cm².
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Mean = (15 + 4 + 10 + 19)/4 = 12.
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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.
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Use combinations: C(10,3) = 120.
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Probability = favourable outcomes ÷ total outcomes.