- Why American confuse about world?

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Can someone help me out with a Statistics problem?? File is attached with problem.? A man is 5 times as old as his son 2 years ago the sum of the squares of their age was 114 find the present age of son?answer is 7? 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}? If the sun turned black would night still be after sunset? 2 spheres of .02 and .04 m are at distance of .14 m with 40C charges each. Whats the force between them?