Find the second derivative of the function

f(x)=(x+1)/(x-1)

How many $20 bills do you need to have to make $280

A33 gram sample of a substance that's used to detect explosives has a k-value of 0.1473. n = noekt no = initial mass (at time t = 0) n = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days

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