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What is the average velocity in a pipe, if the diameter of the pipe is 0.82 cm and the flow rate is 90 cm^3/s? What any normal household weighs 500 grams? Find a rational zero of the polynomial function and use it to find all the zeros of the function. f(x)=1/4x^2(x^2-3)(x+2)? How to differentiate: x^y + y^x = c?? Please help urgently..? Is being old relative to the culture one lives in or is it purely biologically determined?