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In the linear rule (C(d)=15+2d), what is the initial value?

Answer and explanation

Correct answer: 15

The initial value is the value when the independent variable is 0. Here, putting d=0 gives C(0)=15+2(0)=15, so the correct answer is 15. The number 2 is the coefficient of d; it represents the rate of increase per unit, not the initial value. Exam tip: in the form y=a+bx, a is the initial value.

Related tags

Linear EquationsInitial ValuePolynomialsSubstitutionLinear GrowthLinear Growth And DecayIntroduction To PolynomialsMathematics

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