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In the model (R(t)=r-7t), (R(3)=112) and (R(s)=63). What is (s)?मॉडल (R(t)=r-7t) में (R(3)=112) और (R(s)=63) है। (s) क्या है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: \(10\)\(10\)
Given \(R(t)=r-7t\), substitute \(R(3)=112\): \(r-7(3)=112\), so \(r=133\). Next, \(R(s)=63\) gives \(133-7s=63\), hence \(7s=70\) and \(s=10\). If \(s=9\), the model gives \(70\), not \(63\). Exam tip: first find the constant \(r\) using the known time, then use the second condition to solve for the variable.दिया है \(R(t)=r-7t\)। \(R(3)=112\) रखने पर \(r-7(3)=112\), अतः \(r=133\)। अब \(R(s)=63\) से \(133-7s=63\), इसलिए \(7s=70\) और \(s=10\)। विकल्प \(9\) लेने पर मान \(70\) आता है, \(63\) नहीं। परीक्षा टिप: पहले ज्ञात समय का मान रखकर नियतांक \(r\) ज्ञात करें, फिर दूसरे मान से चर हल करें।
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