A student's solved questions increase as (Q(w)=30+8w). How many questions will there be at (w=5)?
Answer and explanation
Correct answer: 70
Given \(Q(w)=30+8w\). Substituting \(w=5\), \(Q(5)=30+8\times5=30+40=70\). Therefore, the student will have solved 70 questions. Option 40 represents only \(8\times5\) and misses the initial 30 questions. Exam tip: after substituting a value in a linear expression, multiply first and then add or subtract.
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What is the correct answer to this question?
70
Why is this the correct answer?
Given \(Q(w)=30+8w\). Substituting \(w=5\), \(Q(5)=30+8\times5=30+40=70\). Therefore, the student will have solved 70 questions. Option 40 represents only \(8\times5\) and misses the initial 30 questions. Exam tip: after substituting a value in a linear expression, multiply first and then add or subtract.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Introduction to Polynomials. Topic: Linear growth and decay.
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