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Please explain everything.

Please explain everything.
1) Use the shell method to set up the integral that represents the volume of the solid formed by revolving the region bounded by the graphs of y=1/x and 2x+2y=5 about the line y=1/2. ( Do not evaluate the integral)
2) Find the volume of the solid formed by revolving the region bounded by the graphs of y=x^2 and y=2 about the x-axis.
3) Write the definite integral that represents the arc length of one period of the curve y=sin2x (do not evaluate the integral)
4) Write the definite integral that represents  the area of the surface formed by revolving the graph of f(x)= x^1/2 on the interval (0, 4) about the y-axis (do not evaluate the integral)

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