Question
As several studies shows over (1)/ the years, the annual
data is useful in (2)/ reviewing trends of extreme events. (3)/ No error. (4) In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option. If a sentence is free from error, select No Error.Solution
Since the subject is ‘several studies’, the verb should be ‘show’, not ‘shows’.

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In ∆ ABC, MN ‖ BC, the area of quadrilateral MBCN=130 sqcm. If AN : NC = 4 : 5, then the area of ∆ MAN is:
Suppose xy = -15 and (x² + y²) = 34, then determine the value of (x – y).
If x = 21, then the value of x5 - 22x4 + 22x3 - 22x2 + 22x - 1 is