(Solution Library) After x weeks the number of persons using a new drug was N(x)=x^4-x^3+1808. At what percentage rate was the use of the drug changing
Question: After x weeks the number of persons using a new drug was \(N\left( x \right)={{x}^{4}}-{{x}^{3}}+1808\).
- At what percentage rate was the use of the drug changing after four weeks?
- By how much did the number of persons using this drug actually change during the fourth week?
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