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If (U(t)=64-4t), when will (U(t)=28)?
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Answer and explanation
Correct answer: \(t=9\)
Given \(U(t)=64-4t\), set \(U(t)=28\): \(64-4t=28\). Thus, \(4t=36\), so \(t=9\). For example, at \(t=8\), \(U(8)=32\), not 28. Exam tip: substitute your final value back into the original expression to verify it.
Frequently asked questions
What is the correct answer to this question?
\(t=9\)
Why is this the correct answer?
Given \(U(t)=64-4t\), set \(U(t)=28\): \(64-4t=28\). Thus, \(4t=36\), so \(t=9\). For example, at \(t=8\), \(U(8)=32\), not 28. Exam tip: substitute your final value back into the original expression to verify it.
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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