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Which linear polynomial represents a quantity decreasing at a constant rate as time \(t\) increases?समय \(t\) बढ़ने पर किसी राशि में स्थिर दर से कमी दर्शाने वाला रैखिक बहुपद कौन-सा है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: \(R(t)=90-5t\)\(R(t)=90-5t\)
In \(R(t)=90-5t\), the coefficient of \(t\) is \(-5\), so \(R\) falls by 5 units when \(t\) rises by 1. \(90+5t\) represents growth. Exam tip: a negative linear coefficient indicates decay.\(R(t)=90-5t\) में \(t\) का गुणांक \(-5\) है, इसलिए \(t\) में 1 की वृद्धि पर \(R\) 5 इकाई घटता है। \(90+5t\) वृद्धि दर्शाता है। परीक्षा टिप: ऋणात्मक रैखिक गुणांक क्षय बताता है।
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