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If (F(t)=20+rt) and (F(3)=41), what is (F(7))?यदि (F(t)=20+rt) और (F(3)=41), तो (F(7)) क्या है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: 6969
Given \(F(t)=20+rt\) and \(F(3)=41\), we get \(20+3r=41\). Thus, \(3r=21\) and \(r=7\). Now \(F(7)=20+7\times7=69\). The value 62 would result from using an incorrect rate or value of \(t\). Exam tip: first find \(r\) from the given function value, then substitute the required \(t\).दिया है कि \(F(t)=20+rt\) और \(F(3)=41\)। अतः \(20+3r=41\), इसलिए \(3r=21\) तथा \(r=7\)। अब \(F(7)=20+7\times7=69\) होगा। विकल्प 62 तब मिलता यदि वृद्धि-दर या \(t\) का मान गलत लिया जाए। परीक्षा टिप: पहले दिए गए फलन-मान से \(r\) ज्ञात करें, फिर आवश्यक \(t\) रखिए।
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