alleryAn elementary strip of height y and width dx has an area equal to:
Ay minus dx
By over dx
Cy times dx
Dy plus dx
Answer & Solution
Correct answer: C. y times dx
1. The strip is treated as a rectangle because it is so thin.
2. A rectangle has area equal to height times width.
3. The area of the elementary strip is y dx.
4. Here y is the value of the function at that point.
_Source: syllabus Mathematics Part II, Ch 8 'Application of Integrals'_
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