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How to find the lateral area, surface area and volume

Which of the points a(6, 2), b(0, 0), c(3, 2), d(−12, 8), e(−12, −8) belong to the graph of direct variation y= 2/3 x?

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle

The median for the given set of six ordered data values is 29.5 9 12 25 __ 41 48 what is the missing value?