- What is x > 4?

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Math help please? I cant find the equation for this graph? Surface by rotating the arc y^2=9x from x=0 to 4 through 2π around x axis is 49π.Show that
x̄ of this surface is: 3/49*integral{x(4x+9)dx}? Difference between tubular secretion and counter current exchange? If (1/x)+(2/y)+(3/z)=1, then z=(axy/bxy-2x-cy), where a,b, and c are positive integers. Find the value of a+b+c.? How do I find a complete list of human genes which have multiple splice variants?