If (J(t)=81-7t), what is (J(t)) at (t=8)?
Answer and explanation
Correct answer: 25
Given \(J(t)=81-7t\). Substituting \(t=8\), we get \(J(8)=81-7(8)=81-56=25\). Therefore, 25 is the correct option. The value 32 could result from incorrectly calculating \(7\times8\) as 49. Exam tip: substitute the value first, then perform multiplication before subtraction.
Frequently asked questions
What is the correct answer to this question?
25
Why is this the correct answer?
Given \(J(t)=81-7t\). Substituting \(t=8\), we get \(J(8)=81-7(8)=81-56=25\). Therefore, 25 is the correct option. The value 32 could result from incorrectly calculating \(7\times8\) as 49. Exam tip: substitute the value first, then perform multiplication before 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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