- Show that if a and b are sets and a ⊂ b then |a| ≤ |b| ?

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18a^(3)-57a^(2)+9a? "curve is such that dy/dx=2-8(3x+4)^-0.5 The curve intersects the y-axis where y=4/3 Find the equation of the curve." please help me.? I am planning to drink more water everyday. Over time, will my bladder adjust to the need to pee so that I don't need to pee all the time? If wave is oscillation of a matter how electromagnetic wave travels in non material space ? (1-cos2x) (cosec x)?