If (M(t)=90-7t), what is the value of (M(t)) at (t=5)?
Answer and explanation
Correct answer: 55
Given \(M(t)=90-7t\). Substituting \(t=5\), \(M(5)=90-7(5)=90-35=55\). Therefore, the correct answer is 55. The value 35 is only \(7\times5\); it must be subtracted from 90. Exam tip: To evaluate a function, substitute the given value for the variable and follow the order of operations carefully.
Frequently asked questions
What is the correct answer to this question?
55
Why is this the correct answer?
Given \(M(t)=90-7t\). Substituting \(t=5\), \(M(5)=90-7(5)=90-35=55\). Therefore, the correct answer is 55. The value 35 is only \(7\times5\); it must be subtracted from 90. Exam tip: To evaluate a function, substitute the given value for the variable and follow the order of operations 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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