यदि (y=480-30x), तो (y) में (210) की कमी के लिए (x) कितना बढ़ना चाहिए?
If (y=480-30x), by how much should (x) increase for (y) to decrease by (210)?
Explanation opens after your attempt
C. (7)
Concept
The total decrease is \(30\Delta x\). From \(30\Delta x=210\), \(\Delta x=7\).
Why this answer is correct
The correct answer is C. (7). The total decrease is \(30\Delta x\). From \(30\Delta x=210\), \(\Delta x=7\).
Exam Tip
कुल कमी \(30\Delta x\) होगी। \(30\Delta x=210\) से \(\Delta x=7\) मिलता है।
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