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If (N(t)=80-2t), what is the value of (N(0)-N(10))?
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Answer and explanation
Correct answer: 20
Given \(N(t)=80-2t\), we get \(N(0)=80\) and \(N(10)=80-2\times10=60\). Therefore, \(N(0)-N(10)=80-60=20\). Option 60 is the value of \(N(10)\), not the required difference. Exam tip: First evaluate the function at both given times, then subtract the values carefully.
Frequently asked questions
What is the correct answer to this question?
20
Why is this the correct answer?
Given \(N(t)=80-2t\), we get \(N(0)=80\) and \(N(10)=80-2\times10=60\). Therefore, \(N(0)-N(10)=80-60=20\). Option 60 is the value of \(N(10)\), not the required difference. Exam tip: First evaluate the function at both given times, then subtract the values carefully.
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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