Showing in Solid of Revolution

Calculus1) a) `y = 3/x` , `x>0` The area under the graph is given by `int_0^infty 3/x dx = 3log(x)_0^infty = 3[lim_(x> infty)log(x)  lim_(x>0)log(x)] ` `= lim_(x> infty) x` b) `y = 12x`,...