If (N(x)=45-5x), what is (N(7))?
Answer and explanation
Correct answer: 10
Substitute 7 for x: \(N(7)=45-5\times7=45-35=10\). Therefore, the correct answer is 10. A value such as 15 can result from an error in calculating \(5\times7\) or in subtraction. Exam tip: when evaluating a function, substitute the given value first, then perform multiplication and subtraction.
Frequently asked questions
What is the correct answer to this question?
10
Why is this the correct answer?
Substitute 7 for x: \(N(7)=45-5\times7=45-35=10\). Therefore, the correct answer is 10. A value such as 15 can result from an error in calculating \(5\times7\) or in subtraction. Exam tip: when evaluating a function, substitute the given value first, then perform multiplication and subtraction.
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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