If (Y(t)=66-6t), what is the decrease from (Y(2)) to (Y(3))?
Answer and explanation
Correct answer: 6
Here, \(Y(2)=66-6(2)=54\) and \(Y(3)=66-6(3)=48\). Therefore, the decrease from \(Y(2)\) to \(Y(3)\) is \(54-48=6\). A decrease of \(12\) would occur over two time units, whereas this question compares consecutive time values. Exam tip: in a linear expression \(a-bt\), the value decreases by \(b\) whenever \(t\) increases by one unit.
Frequently asked questions
What is the correct answer to this question?
6
Why is this the correct answer?
Here, \(Y(2)=66-6(2)=54\) and \(Y(3)=66-6(3)=48\). Therefore, the decrease from \(Y(2)\) to \(Y(3)\) is \(54-48=6\). A decrease of \(12\) would occur over two time units, whereas this question compares consecutive time values. Exam tip: in a linear expression \(a-bt\), the value decreases by \(b\) whenever \(t\) increases by one unit.
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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