यदि (D(t)=120-kt) और (D(3)-D(9)=42), तो (k) क्या है?

If (D(t)=120-kt) and (D(3)-D(9)=42), what is (k)?

Author: Muft Shiksha Editorial Team Published:
Explanation opens after your attempt
Correct Answer

C. (7)

Step 1

Concept

(D(3)-D(9)=k(9-3)=6k). From (6k=42), (k=7).

Step 2

Why this answer is correct

The correct answer is C. (7). (D(3)-D(9)=k(9-3)=6k). From (6k=42), (k=7).

Step 3

Exam Tip

(D(3)-D(9)=k(9-3)=6k) है। (6k=42) से (k=7) मिलता है।

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Mathematics Answer, Explanation and Revision Hints

यदि (D(t)=120-kt) और (D(3)-D(9)=42), तो (k) क्या है? / If (D(t)=120-kt) and (D(3)-D(9)=42), what is (k)?

Correct Answer: C. (7). Explanation: (D(3)-D(9)=k(9-3)=6k) है। (6k=42) से (k=7) मिलता है। / (D(3)-D(9)=k(9-3)=6k). From (6k=42), (k=7).

Which concept should I revise for this Mathematics MCQ?

(D(3)-D(9)=k(9-3)=6k). From (6k=42), (k=7).

What exam hint can help solve this Mathematics question?

(D(3)-D(9)=k(9-3)=6k) है। (6k=42) से (k=7) मिलता है।