If (K(t)=70-3t), what is the value of (K(2)-K(5))?
Answer and explanation
Correct answer: 9
First find the two values: \(K(2)=70-3\times2=64\) and \(K(5)=70-3\times5=55\). Therefore, \(K(2)-K(5)=64-55=9\), so option C is correct. The distractor 15 may result from taking only \(3\times5\) instead of evaluating and subtracting the function values. Exam tip: evaluate each function value separately before finding their difference.
Frequently asked questions
What is the correct answer to this question?
9
Why is this the correct answer?
First find the two values: \(K(2)=70-3\times2=64\) and \(K(5)=70-3\times5=55\). Therefore, \(K(2)-K(5)=64-55=9\), so option C is correct. The distractor 15 may result from taking only \(3\times5\) instead of evaluating and subtracting the function values. Exam tip: evaluate each function value separately before finding their difference.
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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