Chap8 Section7

Elementary and Intermediate Algebra: Graphs & Models (3rd Edition)

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Section 8.7 Exponential Growth and Decay 857 Version: Fall 2007 8.7 Exercises 1. Suppose that the population of a cer- tain town grows at an annual rate of 6%. If the population is currently 5 , 000 , what will it be in 7 years? Round your answer to the nearest integer. 2. Suppose that the population of a cer- tain town grows at an annual rate of 5%. If the population is currently 2,000, how many years will it take for it to double? Round your answer to the nearest hun- dredth. 3. Suppose that a certain radioactive isotope has an annual decay rate of 7.2%. How many years will it take for a 227 gram sample to decay to 93 grams? Round your answer to the nearest hundredth. 4. Suppose that a certain radioactive isotope has an annual decay rate of 6.8%. How many years will it take for a 399 gram sample to decay to 157 grams? Round your answer to the nearest hundredth. 5. Suppose that the population of a cer- tain town grows at an annual rate of 8%. If the population is currently 4,000, how many years will it take for it to double? Round your answer to the nearest hun- dredth. 6. Suppose that a certain radioactive isotope has an annual decay rate of 19.2%. Starting with a 443 gram sample, how many grams will be left after 9 years? Round your answer to the nearest hun- dredth. 7. Suppose that a certain radioactive isotope has an annual decay rate of 17.4%. Copyrighted material. See: 1 What is the half-life (in years) of the iso- tope? Round your answer to the nearest hundredth. 8. Suppose that the population of a cer- tain town grows at an annual rate of 7%. If the population is currently 8,000, how many years will it take for it to reach 18,000? Round your answer to the near- est hundredth. 9. Suppose that a certain radioactive isotope has an annual decay rate of 17.3%. Starting with a 214 gram sample, how many grams will be left after 5 years? Round your answer to the nearest hun- dredth. 10. Suppose that the population of a certain town grows at an annual rate of 7%. If the population grows to 2 , 000 in 7 years, what was the original popula- tion? Round your answer to the nearest integer. 11. Suppose that the population of a certain town grows at an annual rate of 3%. If the population is currently 3,000, how many years will it take for it to dou- ble? Round your answer to the nearest hundredth.
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern