- Moments problem - easy maths worksheet?

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How does bond angle in a molecule depends on bond polarity and bond length? Take example of ammonia and methane.? Differentiate between Impactor and Impinger in aerosol sampling.? Find the range of values of k such that 2x^2+4kx-k is always positive for all real values of x. [4]? What involves in decrease entropy? X and y are positive integers. then x/y + y/x is
always >2
always >=2
sometimes =2
always <2
sometimes <2?