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A student's practice questions increase as (Q(w)=20+10w). How many questions will there be at (w=4)?

Answer and explanation

Correct answer: 60

Substitute \(w=4\) into the expression: \(Q(4)=20+10\times4=20+40=60\). Therefore, the number of practice questions is 60. The value 40 represents only \(10\times4\); the initial 20 questions must also be added. Exam tip: When evaluating a linear expression, substitute the variable value, multiply first, and then add or subtract.

Related tags

Linear PolynomialEvaluating ExpressionsSubstitutionLinear GrowthWord ProblemLinear Growth And DecayIntroduction To PolynomialsMathematics

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