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The price of an item is (P(n)=a+25n). If (P(4)=210), what is (P(12))?

Answer and explanation

Correct answer: 410

Given P(n)=a+25n and P(4)=210, we get a+25(4)=210. Thus, a+100=210, so a=110. Now P(12)=110+25(12)=110+300=410. Therefore, 410 is the correct answer. The value 385 may result from incorrectly counting 7 steps from 4 to 12; the correct difference is 12−4=8 steps. Exam tip: In a linear expression, first use the given value to find the constant a.

Related tags

PolynomialsLinear ExpressionLinear GrowthSubstitutionAlgebraLinear Growth And DecayIntroduction To PolynomialsMathematics

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