Math and Statistics Homework Help
College Math Statistics Physics Economics Pre-Calculus

homework help forum today's math problem links
utilities previous math problem feedback

frequently asked questions
virtual store
live assistance
request a free quote
make a payment

We accept credit cards
Pay safely with Paypal



8. After x weeks the number of persons using a new drug was . At what percentage rate was the use of the drug changing after four weeks?

Solution: Let’s compute

We can take two approaches: by derivatives (approximation) or exactly:

  • Derivatives:

After four weeks the derivative is computed as

which means that approximately 208 new people a week use the drug after four weeks. We also know that

the percentage rate the use of the drug is changing after four weeks is 10.4% (approximation using derivatives).

  • Exactly:

We can compute the percentage exactly as:

(b) By how much did the number of persons using this drug actually change during the fourth week?

Solution: We can find the exact change computing

MGT - Your source of Math and Statistics Homework Help


Statistics Help   |   Calculus Homework   |   Operations Management Help   |   Request a Quote     |     Calculus II and III     |    Linear Algebra